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Diff for /OpenXM/src/k097/lib/minimal/minimal.k between version 1.7 and 1.16

version 1.7, 2000/05/06 10:35:33 version 1.16, 2000/06/15 07:38:36
Line 1 
Line 1 
 /* $OpenXM: OpenXM/src/k097/lib/minimal/minimal.k,v 1.6 2000/05/06 07:58:37 takayama Exp $ */  /* $OpenXM: OpenXM/src/k097/lib/minimal/minimal.k,v 1.15 2000/06/14 07:44:05 takayama Exp $ */
 #define DEBUG 1  #define DEBUG 1
 /* #define ORDINARY 1 */  /* #define ORDINARY 1 */
 /* If you run this program on openxm version 1.1.2 (FreeBSD),  /* If you run this program on openxm version 1.1.2 (FreeBSD),
Line 6 
Line 6 
    ln -s /usr/bin/cpp /lib/cpp     ln -s /usr/bin/cpp /lib/cpp
 */  */
 #define OFFSET 0  #define OFFSET 0
 #define TOTAL_STRATEGY  #define TOTAL_STRATEGY 1
 /* #define OFFSET 20*/  /* #define OFFSET 20*/
 /* Test sequences.  /* Test sequences.
    Use load["minimal.k"];;     Use load["minimal.k"];;
Line 132  sm1(" [(AvoidTheSameRing)] pushEnv 
Line 132  sm1(" [(AvoidTheSameRing)] pushEnv 
       [ [(AvoidTheSameRing) 0] system_variable        [ [(AvoidTheSameRing) 0] system_variable
         [(gbListTower) tower (list) dc] system_variable          [(gbListTower) tower (list) dc] system_variable
       ] pop popEnv ");        ] pop popEnv ");
         /* sm1("(hoge) message show_ring "); */
 }  }
   
 def SresolutionFrameWithTower(g,opt) {  def SresolutionFrameWithTower(g,opt) {
   local gbTower, ans, ff, count, startingGB, opts, skelton,withSkel, autof,    local gbTower, ans, ff, count, startingGB, opts, skelton,withSkel, autof,
         gbasis;          gbasis, nohomog;
     nohomog = false;
     count = -1;
   if (Length(Arglist) >= 2) {    if (Length(Arglist) >= 2) {
     if (IsInteger(opt)) count = opt;      if (IsInteger(opt)) {
         count = opt;
       }else if (IsString(opt)) {
         if (opt == "homogenized") {
            nohomog = true;
         }else{
            Println("Warning: unknown option");
            Println(opt);
         }
       }
   }else{    }else{
     count = -1;      count = -1;
   }    }
Line 152  def SresolutionFrameWithTower(g,opt) {
Line 164  def SresolutionFrameWithTower(g,opt) {
   */    */
   
   sm1(" (mmLarger) (matrix) switch_function ");    sm1(" (mmLarger) (matrix) switch_function ");
   g = Map(g,"Shomogenize");    if (! nohomog) {
       Println("Automatic homogenization.");
       g = Map(g,"Shomogenize");
     }else{
       Println("No automatic homogenization.");
     }
   if (SonAutoReduce) {    if (SonAutoReduce) {
     sm1("[ (AutoReduce) ] system_variable /autof set ");      sm1("[ (AutoReduce) ] system_variable /autof set ");
     sm1("[ (AutoReduce) 1 ] system_variable ");      sm1("[ (AutoReduce) 1 ] system_variable ");
Line 192  def SresolutionFrameWithTower(g,opt) {
Line 209  def SresolutionFrameWithTower(g,opt) {
 }  }
 HelpAdd(["SresolutionFrameWithTower",  HelpAdd(["SresolutionFrameWithTower",
 ["It returs [resolution of the initial, gbTower, skelton, gbasis]",  ["It returs [resolution of the initial, gbTower, skelton, gbasis]",
    "option: \"homogenized\" (no automatic homogenization) ",
  "Example: Sweyl(\"x,y\");",   "Example: Sweyl(\"x,y\");",
  "         a=SresolutionFrameWithTower([x^3,x*y,y^3-1]);"]]);   "         a=SresolutionFrameWithTower([x^3,x*y,y^3-1]);"]]);
   
 def SresolutionFrame(f,opt) {  def SresolutionFrame(f,opt) {
   local ans;    local ans;
   ans = SresolutionFrameWithTower(f);    ans = SresolutionFrameWithTower(f,opt);
   return(ans[0]);    return(ans[0]);
 }  }
 /* ---------------------------- */  /* ---------------------------- */
Line 291  def Sres0FrameWithSkelton(g) {
Line 309  def Sres0FrameWithSkelton(g) {
   
   
 def StotalDegree(f) {  def StotalDegree(f) {
   sm1(" [(grade) f] gbext (universalNumber) dc /FunctionValue set ");    local d0;
     sm1(" [(grade) f] gbext (universalNumber) dc /d0 set ");
     /* Print("degree of "); Print(f); Print(" is "); Println(d0); */
     return(d0);
 }  }
   
 /* Sord_w(x^2*Dx*Dy,[x,-1,Dx,1]); */  /* Sord_w(x^2*Dx*Dy,[x,-1,Dx,1]); */
Line 359  def Sdegree(f,tower,level) {
Line 380  def Sdegree(f,tower,level) {
   
 def SgenerateTable(tower) {  def SgenerateTable(tower) {
   local height, n,i,j, ans, ans_at_each_floor;    local height, n,i,j, ans, ans_at_each_floor;
   
     /*
     Print("SgenerateTable: tower=");Println(tower);
     sm1(" print_switch_status "); */
   height = Length(tower);    height = Length(tower);
   ans = NewArray(height);    ans = NewArray(height);
   for (i=0; i<height; i++) {    for (i=0; i<height; i++) {
Line 434  def SmaxOfStrategy(a) {
Line 459  def SmaxOfStrategy(a) {
 }  }
   
   
 def SlaScala(g) {  def SlaScala(g,opt) {
   local rf, tower, reductionTable, skel, redundantTable, bases,    local rf, tower, reductionTable, skel, redundantTable, bases,
         strategy, maxOfStrategy, height, level, n, i,          strategy, maxOfStrategy, height, level, n, i,
         freeRes,place, f, reducer,pos, redundant_seq,bettiTable,freeResV,ww,          freeRes,place, f, reducer,pos, redundant_seq,bettiTable,freeResV,ww,
Line 443  def SlaScala(g) {
Line 468  def SlaScala(g) {
   /* extern WeightOfSweyl; */    /* extern WeightOfSweyl; */
   ww = WeightOfSweyl;    ww = WeightOfSweyl;
   Print("WeightOfSweyl="); Println(WeightOfSweyl);    Print("WeightOfSweyl="); Println(WeightOfSweyl);
   rf = SresolutionFrameWithTower(g);    rf = SresolutionFrameWithTower(g,opt);
     Print("rf="); sm1_pmat(rf);
   redundant_seq = 1;   redundant_seq_ordinary = 1;    redundant_seq = 1;   redundant_seq_ordinary = 1;
   tower = rf[1];    tower = rf[1];
   
     Println("Generating reduction table which gives an order of reduction.");
     Print("WeghtOfSweyl="); Println(WeightOfSweyl);
     Print("tower"); Println(tower);
   reductionTable = SgenerateTable(tower);    reductionTable = SgenerateTable(tower);
     Print("reductionTable="); sm1_pmat(reductionTable);
   
   skel = rf[2];    skel = rf[2];
   redundantTable = SnewArrayOfFormat(rf[1]);    redundantTable = SnewArrayOfFormat(rf[1]);
   redundantTable_ordinary = SnewArrayOfFormat(rf[1]);    redundantTable_ordinary = SnewArrayOfFormat(rf[1]);
Line 467  def SlaScala(g) {
Line 499  def SlaScala(g) {
         Println([level,i]);          Println([level,i]);
         reductionTable_tmp[i] = -200000;          reductionTable_tmp[i] = -200000;
         if (reductionTable[level,i] == strategy) {          if (reductionTable[level,i] == strategy) {
            Print("Processing "); Print([level,i]);             Print("Processing [level,i]= "); Print([level,i]);
            Print("   Strategy = "); Println(strategy);             Print("   Strategy = "); Println(strategy);
            if (level == 0) {             if (level == 0) {
              if (IsNull(redundantTable[level,i])) {               if (IsNull(redundantTable[level,i])) {
Line 661  def MonomialPart(f) {
Line 693  def MonomialPart(f) {
   sm1(" [(lmonom) f] gbext /FunctionValue set ");    sm1(" [(lmonom) f] gbext /FunctionValue set ");
 }  }
   
   /* WARNING:
     When you use SwhereInTower, you have to change gbList
     as below. Ofcourse, you should restrore the gbList
     SsetTower(StowerOf(tower,level));
     pos = SwhereInTower(syzHead,tower[level]);
   */
 def SwhereInTower(f,tower) {  def SwhereInTower(f,tower) {
   local i,n,p,q;    local i,n,p,q;
   if (f == Poly("0")) return(-1);    if (f == Poly("0")) return(-1);
Line 697  def SpairAndReduction(skel,level,ii,freeRes,tower,ww) 
Line 735  def SpairAndReduction(skel,level,ii,freeRes,tower,ww) 
   
   tower2 = StowerOf(tower,level-1);    tower2 = StowerOf(tower,level-1);
   SsetTower(tower2);    SsetTower(tower2);
     Println(["level=",level]);
     Println(["tower2=",tower2]);
   /** sm1(" show_ring ");   */    /** sm1(" show_ring ");   */
   
   gi = Stoes_vec(bases[i]);    gi = Stoes_vec(bases[i]);
Line 730  def SpairAndReduction(skel,level,ii,freeRes,tower,ww) 
Line 770  def SpairAndReduction(skel,level,ii,freeRes,tower,ww) 
   sj = sj*tmp[1]+t_syz[j];    sj = sj*tmp[1]+t_syz[j];
   t_syz[i] = si;    t_syz[i] = si;
   t_syz[j] = sj;    t_syz[j] = sj;
   
     SsetTower(StowerOf(tower,level));
   pos = SwhereInTower(syzHead,tower[level]);    pos = SwhereInTower(syzHead,tower[level]);
   
     SsetTower(StowerOf(tower,level-1));
   pos2 = SwhereInTower(tmp[0],tower[level-1]);    pos2 = SwhereInTower(tmp[0],tower[level-1]);
   ans = [tmp[0],t_syz,pos,pos2,vdeg,vdeg_reduced];    ans = [tmp[0],t_syz,pos,pos2,vdeg,vdeg_reduced];
   /* pos is the place to put syzygy at level. */    /* pos is the place to put syzygy at level. */
Line 843  def Sbases_to_vec(bases,size) {
Line 887  def Sbases_to_vec(bases,size) {
   return(newbases);    return(newbases);
 }  }
   
 def Sminimal(g) {  HelpAdd(["Sminimal",
   ["It constructs the V-minimal free resolution by LaScala-Stillman's algorithm",
    "option: \"homogenized\" (no automatic homogenization ",
    "Example:  Sweyl(\"x,y\",[[\"x\",-1,\"y\",-1,\"Dx\",1,\"Dy\",1]]);",
    "          v=[[2*x*Dx + 3*y*Dy+6, 0],",
    "             [3*x^2*Dy + 2*y*Dx, 0],",
    "             [0,  x^2+y^2],",
    "             [0,  x*y]];",
    "         a=Sminimal(v);",
    "         Sweyl(\"x,y\",[[\"x\",-1,\"y\",-1,\"Dx\",1,\"Dy\",1]]);",
    "         b = ReParse(a[0]); sm1_pmat(b); ",
    "         IsExact_h(b,[x,y]):",
    "Note:  a[0] is the V-minimal resolution. a[3] is the Schreyer resolution."]]);
   
   def Sminimal(g,opt) {
   local r, freeRes, redundantTable, reducer, maxLevel,    local r, freeRes, redundantTable, reducer, maxLevel,
         minRes, seq, maxSeq, level, betti, q, bases, dr,          minRes, seq, maxSeq, level, betti, q, bases, dr,
         betti_levelplus, newbases, i, j,qq;          betti_levelplus, newbases, i, j,qq, tminRes;
   r = SlaScala(g);    if (Length(Arglist) < 2) {
        opt = null;
     }
     ScheckIfSchreyer("Sminimal:0");
     r = SlaScala(g,opt);
   /* Should I turn off the tower?? */    /* Should I turn off the tower?? */
     ScheckIfSchreyer("Sminimal:1");
   freeRes = r[0];    freeRes = r[0];
   redundantTable = r[1];    redundantTable = r[1];
   reducer = r[2];    reducer = r[2];
Line 904  def Sminimal(g) {
Line 967  def Sminimal(g) {
       }        }
     }      }
    }     }
    return([Stetris(minRes,redundantTable),     tminRes = Stetris(minRes,redundantTable);
      return([SpruneZeroRow(tminRes), tminRes,
           [ minRes, redundantTable, reducer,r[3],r[4]],r[0]]);            [ minRes, redundantTable, reducer,r[3],r[4]],r[0]]);
   /* r[4] is the redundantTable_ordinary */    /* r[4] is the redundantTable_ordinary */
   /* r[0] is the freeResolution */    /* r[0] is the freeResolution */
Line 1044  def Sannfs2(f) {
Line 1108  def Sannfs2(f) {
   Sweyl("x,y",[["x",1,"y",1,"Dx",1,"Dy",1,"h",1],    Sweyl("x,y",[["x",1,"y",1,"Dx",1,"Dy",1,"h",1],
                ["x",-1,"y",-1,"Dx",1,"Dy",1]]); */                 ["x",-1,"y",-1,"Dx",1,"Dy",1]]); */
   /* Sweyl("x,y",[["x",1,"y",1,"Dx",1,"Dy",1,"h",1]]); */    /* Sweyl("x,y",[["x",1,"y",1,"Dx",1,"Dy",1,"h",1]]); */
   
   Sweyl("x,y",[["x",-1,"y",-1,"Dx",1,"Dy",1]]);    Sweyl("x,y",[["x",-1,"y",-1,"Dx",1,"Dy",1]]);
   pp = Map(p,"Spoly");    pp = Map(p,"Spoly");
   return(Sminimal_v(pp));    return(Sminimal_v(pp));
   /* return(Sminimal(pp)); */    /* return(Sminimal(pp)); */
 }  }
   
   HelpAdd(["Sannfs2",
   ["Sannfs2(f) constructs the V-minimal free resolution for the weight (-1,1)",
    "of the Laplace transform of the annihilating ideal of the polynomial f in x,y.",
    "See also Sminimal_v, Sannfs3.",
    "Example: a=Sannfs2(\"x^3-y^2\");",
    "         b=a[0]; sm1_pmat(b);",
    "         b[1]*b[0]:",
    "Example: a=Sannfs2(\"x*y*(x-y)*(x+y)\");",
    "         b=a[0]; sm1_pmat(b);",
    "         b[1]*b[0]:"
   ]]);
   
 /* Do not forget to turn on TOTAL_STRATEGY */  /* Do not forget to turn on TOTAL_STRATEGY */
 def Sannfs2_laScala(f) {  def Sannfs2_laScala(f) {
   local p,pp;    local p,pp;
Line 1063  def Sannfs2_laScala(f) {
Line 1140  def Sannfs2_laScala(f) {
   return(Sminimal(pp));    return(Sminimal(pp));
 }  }
   
   def Sannfs2_laScala2(f) {
     local p,pp;
     p = Sannfs(f,"x,y");
     sm1(" p 0 get { [(x) (y) (Dx) (Dy)] laplace0 } map /p set ");
     p = [p];
     Sweyl("x,y",[["x",1,"y",1,"Dx",1,"Dy",1,"h",1],
                  ["x",-1,"y",-1,"Dx",1,"Dy",1]]);
     pp = Map(p[0],"Spoly");
     return(Sminimal(pp));
   }
   
 def Sannfs3(f) {  def Sannfs3(f) {
   local p,pp;    local p,pp;
   p = Sannfs(f,"x,y,z");    p = Sannfs(f,"x,y,z");
Line 1072  def Sannfs3(f) {
Line 1160  def Sannfs3(f) {
   return(Sminimal_v(pp));    return(Sminimal_v(pp));
 }  }
   
   HelpAdd(["Sannfs3",
   ["Sannfs3(f) constructs the V-minimal free resolution for the weight (-1,1)",
    "of the Laplace transform of the annihilating ideal of the polynomial f in x,y,z.",
    "See also Sminimal_v, Sannfs2.",
    "Example: a=Sannfs3(\"x^3-y^2*z^2\");",
    "         b=a[0]; sm1_pmat(b);",
    "         b[1]*b[0]: b[2]*b[1]:"]]);
   
 /*  /*
   The betti numbers of most examples are 2,1. (0-th and 1-th).    The betti numbers of most examples are 2,1. (0-th and 1-th).
   a=Sannfs2("x*y*(x+y-1)"); ==> The betti numbers are 3, 2.    a=Sannfs2("x*y*(x+y-1)"); ==> The betti numbers are 3, 2.
Line 1080  def Sannfs3(f) {
Line 1176  def Sannfs3(f) {
   
 */  */
   
   def Sannfs3_laScala2(f) {
     local p,pp;
     p = Sannfs(f,"x,y,z");
     sm1(" p 0 get { [(x) (y) (z) (Dx) (Dy) (Dz)] laplace0 } map /p set ");
     Sweyl("x,y,z",[["x",1,"y",1,"z",1,"Dx",1,"Dy",1,"Dz",1,"h",1],
                    ["x",-1,"y",-1,"z",-1,"Dx",1,"Dy",1,"Dz",1]]);
     pp = Map(p,"Spoly");
     return(Sminimal(pp));
   }
   
   
 /*  The below does not use LaScala-Stillman's algorithm. */  /*  The below does not use LaScala-Stillman's algorithm. */
Line 1095  def Sschreyer(g) {
Line 1200  def Sschreyer(g) {
   rf = SresolutionFrameWithTower(g);    rf = SresolutionFrameWithTower(g);
   redundant_seq = 1;   redundant_seq_ordinary = 1;    redundant_seq = 1;   redundant_seq_ordinary = 1;
   tower = rf[1];    tower = rf[1];
     Println("Generating reduction table which gives an order of reduction.");
     Println("But, you are in Sschreyer...., you may not use LaScala-Stillman");
     Print("WeghtOfSweyl="); Println(WeightOfSweyl);
     Print("tower"); Println(tower);
   reductionTable = SgenerateTable(tower);    reductionTable = SgenerateTable(tower);
   skel = rf[2];    skel = rf[2];
   redundantTable = SnewArrayOfFormat(rf[1]);    redundantTable = SnewArrayOfFormat(rf[1]);
Line 1153  def Sschreyer(g) {
Line 1262  def Sschreyer(g) {
                   /* i must be equal to f[2], I think. Double check. */                    /* i must be equal to f[2], I think. Double check. */
   
                   /* Correction Of Constant */                    /* Correction Of Constant */
                     /* Correction of syzygy */
                   c2 = f[6];  /* or -f[6]?  Double check. */                    c2 = f[6];  /* or -f[6]?  Double check. */
                   Print("c2="); Println(c2);                    Print("c2="); Println(c2);
                   nn = Length(bases);                    nn = Length(bases);
                   for (ii=0; ii<nn;ii++) {                    for (ii=0; ii<nn;ii++) {
                      if ((ii != place) && (! IsNull(bases[ii]))) {                       if ((ii != i) && (! IsNull(bases[ii]))) {
                        m = Length(bases[ii]);                         m = Length(bases[ii]);
                        for (jj=0; jj<m; jj++) {                         for (jj=0; jj<m; jj++) {
                          if (jj != place) {                           if (jj != place) {
Line 1178  def Sschreyer(g) {
Line 1288  def Sschreyer(g) {
                   freeRes[level-1] = bases;                    freeRes[level-1] = bases;
                   Print("New freeRes[level-1] = "); sm1_pmat(freeRes[level-1]);                    Print("New freeRes[level-1] = "); sm1_pmat(freeRes[level-1]);
   
                   reducer[level-1,place] = f[1];                    reducer[level-1,place] = f[1]-SunitOfFormat(place,f[1]);
                      /* This reducer is different from that of SlaScala(). */
   
                     reducerBasis = reducer[level-1];
                     nn = Length(reducerBasis);
                     for (ii=0; ii<nn;ii++) {
                        if ((ii != place) && (! IsNull(reducerBasis[ii]))) {
                          m = Length(reducerBasis[ii]);
                          for (jj=0; jj<m; jj++) {
                            if (jj != place) {
                              reducerBasis[ii,jj] = reducerBasis[ii,jj]*c2;
                            }
                          }
                        }
                     }
                     reducer[level-1] = reducerBasis;
   
                }else{                 }else{
                   /* redundantTable[level,i] = 0; */                    /* redundantTable[level,i] = 0; */
                   bases = freeRes[level];                    bases = freeRes[level];
Line 1193  def Sschreyer(g) {
Line 1319  def Sschreyer(g) {
     if (level >= 1) {      if (level >= 1) {
       Println(" ");        Println(" ");
       Print("Triangulating reducer at level "); Println(level-1);        Print("Triangulating reducer at level "); Println(level-1);
         Println("freeRes[level]="); sm1_pmat(freeRes[level]);
       reducerBase = reducer[level-1];        reducerBase = reducer[level-1];
       Print("reducerBase=");  Println(reducerBase);        Print("reducerBase=");  Println(reducerBase);
         Println("Compare freeRes[level] and reducerBase (put -1)");
       m = Length(reducerBase);        m = Length(reducerBase);
       for (ii=m-1; ii>=0; ii--) {        for (ii=m-1; ii>=0; ii--) {
         if (!IsNull(reducerBase[ii])) {          if (!IsNull(reducerBase[ii])) {
            for (jj=ii-1; jj>=0; jj--) {             for (jj=ii-1; jj>=0; jj--) {
              if (!IsNull(reducerBase[jj])) {               if (!IsNull(reducerBase[jj])) {
               if (!IsZero(reducerBase[jj,ii])) {                if (!IsZero(reducerBase[jj,ii])) {
                 reducerBase[jj] = reducerBase[jj]-reducerBase[jj,ii]*reducerBase[ii];                  /* reducerBase[ii,ii] should be always constant. */
                   reducerBase[jj] = reducerBase[ii,ii]*reducerBase[jj]-reducerBase[jj,ii]*reducerBase[ii];
               }                }
              }               }
            }             }
Line 1254  def SpairAndReduction2(skel,level,ii,freeRes,tower,ww,
Line 1383  def SpairAndReduction2(skel,level,ii,freeRes,tower,ww,
   
   tower2 = StowerOf(tower,level-1);    tower2 = StowerOf(tower,level-1);
   SsetTower(tower2);    SsetTower(tower2);
     Println(["level=",level]);
     Println(["tower2=",tower2]);
   /** sm1(" show_ring ");   */    /** sm1(" show_ring ");   */
   
   gi = Stoes_vec(bases[i]);    gi = Stoes_vec(bases[i]);
Line 1311  def SpairAndReduction2(skel,level,ii,freeRes,tower,ww,
Line 1442  def SpairAndReduction2(skel,level,ii,freeRes,tower,ww,
   Print("vdegree of the original = "); Println(vdeg);    Print("vdegree of the original = "); Println(vdeg);
   Print("vdegree of the remainder = "); Println(vdeg_reduced);    Print("vdegree of the remainder = "); Println(vdeg_reduced);
   
     if (!IsNull(vdeg_reduced)) {
       if (vdeg_reduced < vdeg) {
         Println("--- Special in V-minimal!");
         Println(tmp[0]);
         Println("syzygy="); sm1_pmat(t_syz);
         Print("[vdeg, vdeg_reduced] = "); Println([vdeg,vdeg_reduced]);
       }
     }
   
     SsetTower(StowerOf(tower,level));
   pos = SwhereInTower(syzHead,tower[level]);    pos = SwhereInTower(syzHead,tower[level]);
   
     SsetTower(StowerOf(tower,level-1));
   pos2 = SwhereInTower(tmp[0],tower[level-1]);    pos2 = SwhereInTower(tmp[0],tower[level-1]);
   ans = [tmp[0],t_syz,pos,pos2,vdeg,vdeg_reduced,c2];    ans = [tmp[0],t_syz,pos,pos2,vdeg,vdeg_reduced,c2];
   /* pos is the place to put syzygy at level. */    /* pos is the place to put syzygy at level. */
   /* pos2 is the place to put a new GB at level-1. */    /* pos2 is the place to put a new GB at level-1. */
   Println(ans);    Println(ans);
   Println("  ");    Println("--- end of SpairAndReduction2  ");
   return(ans);    return(ans);
 }  }
   
   HelpAdd(["Sminimal_v",
   ["It constructs the V-minimal free resolution from the Schreyer resolution",
    "step by step.",
    "This code still contains bugs. It sometimes outputs wrong answer.",
    "Example:   Sweyl(\"x,y\",[[\"x\",-1,\"y\",-1,\"Dx\",1,\"Dy\",1]]);",
    "          v=[[2*x*Dx + 3*y*Dy+6, 0],",
    "             [3*x^2*Dy + 2*y*Dx, 0],",
    "             [0,  x^2+y^2],",
    "             [0,  x*y]];",
    "         a=Sminimal_v(v);",
    "         sm1_pmat(a[0]); b=a[0]; b[1]*b[0]:",
    "Note:  a[0] is the V-minimal resolution. a[3] is the Schreyer resolution."]]);
   
   /* This code still contains bugs. It sometimes outputs wrong answer. */
   /* See test12() in minimal-test.k.  */
   /* There may be remaining 1, too */
 def Sminimal_v(g) {  def Sminimal_v(g) {
   local r, freeRes, redundantTable, reducer, maxLevel,    local r, freeRes, redundantTable, reducer, maxLevel,
         minRes, seq, maxSeq, level, betti, q, bases, dr,          minRes, seq, maxSeq, level, betti, q, bases, dr,
         betti_levelplus, newbases, i, j,qq;          betti_levelplus, newbases, i, j,qq,tminRes;
   r = Sschreyer(g);    r = Sschreyer(g);
   sm1_pmat(r);    sm1_pmat(r);
   Debug_Sminimal_v = r;    Debug_Sminimal_v = r;
Line 1348  def Sminimal_v(g) {
Line 1507  def Sminimal_v(g) {
           if (level < maxLevel-1) {            if (level < maxLevel-1) {
             bases = freeRes[level+1];              bases = freeRes[level+1];
             dr = reducer[level,q];              dr = reducer[level,q];
             dr[q] = -1;              /* dr[q] = -1;  We do not need this in our reducer format. */
               /* dr[q] should be a non-zero constant. */
             newbases = SnewArrayOfFormat(bases);              newbases = SnewArrayOfFormat(bases);
             betti_levelplus = Length(bases);              betti_levelplus = Length(bases);
             /*              /*
                bases[i,j] ---> bases[i,j]+bases[i,q]*dr[j]                 bases[i,j] ---> bases[i,j]+bases[i,q]*dr[j]
             */              */
             for (i=0; i<betti_levelplus; i++) {              for (i=0; i<betti_levelplus; i++) {
               newbases[i] = bases[i] + bases[i,q]*dr;                newbases[i] = dr[q]*bases[i] - bases[i,q]*dr;
             }              }
             Println(["level, q =", level,q]);              Println(["level, q =", level,q]);
             Println("bases="); sm1_pmat(bases);              Println("bases="); sm1_pmat(bases);
Line 1364  def Sminimal_v(g) {
Line 1524  def Sminimal_v(g) {
             minRes[level+1] = newbases;              minRes[level+1] = newbases;
             freeRes = minRes;              freeRes = minRes;
 #ifdef DEBUG  #ifdef DEBUG
 /*  Do it later.              for (qq=q; qq<betti; qq++) {
             for (qq=0; qq<betti; qq++) {  
                 for (i=0; i<betti_levelplus; i++) {                  for (i=0; i<betti_levelplus; i++) {
                   if (!IsZero(newbases[i,qq])) {                    if ((!IsZero(newbases[i,qq])) && (redundantTable[level,qq] >0)) {
                     Println(["[i,qq]=",[i,qq]," is not zero in newbases."]);                      Println(["[i,qq]=",[i,qq]," is not zero in newbases."]);
                     Print("redundantTable ="); sm1_pmat(redundantTable[level]);                      Print("redundantTable ="); sm1_pmat(redundantTable[level]);
                     Error("Stop in Sminimal for debugging.");                      Error("Stop in Sminimal for debugging.");
                   }                    }
                 }                  }
             }              }
 */  
 #endif  #endif
           }            }
         }          }
       }        }
    }     }
    return([Stetris(minRes,redundantTable),     tminRes = Stetris(minRes,redundantTable);
      return([SpruneZeroRow(tminRes), tminRes,
           [ minRes, redundantTable, reducer,r[3],r[4]],r[0]]);            [ minRes, redundantTable, reducer,r[3],r[4]],r[0]]);
   /* r[4] is the redundantTable_ordinary */    /* r[4] is the redundantTable_ordinary */
   /* r[0] is the freeResolution */    /* r[0] is the freeResolution */
 }  }
   
 /* Sannfs2("x*y*(x-y)*(x+y)"); is a test problem */  /* Sannfs2("x*y*(x-y)*(x+y)"); is a test problem */
   /* x y (x+y-1)(x-2),  x^3-y^2, x^3 - y^2 z^2,
      x y z (x+y+z-1) seems to be interesting, because the first syzygy
     contains 1.
   */
   
   def CopyArray(m) {
     local ans,i,n;
     if (IsArray(m)) {
        n = Length(m);
        ans = NewArray(n);
        for (i=0; i<n; i++) {
          ans[i] = CopyArray(m[i]);
        }
        return(ans);
     }else{
        return(m);
     }
   }
   HelpAdd(["CopyArray",
   ["It duplicates the argument array recursively.",
    "Example: m=[1,[2,3]];",
    "         a=CopyArray(m); a[1] = \"Hello\";",
    "         Println(m); Println(a);"]]);
   
   def IsZeroVector(m) {
     local n,i;
     n = Length(m);
     for (i=0; i<n; i++) {
       if (!IsZero(m[i])) {
         return(false);
       }
     }
     return(true);
   }
   
   def SpruneZeroRow(res) {
     local minRes, n,i,j,m, base,base2,newbase,newbase2, newMinRes;
   
     minRes = CopyArray(res);
     n = Length(minRes);
     for (i=0; i<n; i++) {
       base = minRes[i];
       m = Length(base);
       if (i != n-1) {
         base2 = minRes[i+1];
         base2 = Transpose(base2);
       }
       newbase = [ ];
       newbase2 = [ ];
       for (j=0; j<m; j++) {
         if (!IsZeroVector(base[j])) {
           newbase = Append(newbase,base[j]);
           if (i != n-1) {
             newbase2 = Append(newbase2,base2[j]);
           }
         }
       }
       minRes[i] = newbase;
       if (i != n-1) {
         if (newbase2 == [ ]) {
           minRes[i+1] = [ ];
         }else{
           minRes[i+1] = Transpose(newbase2);
         }
       }
     }
   
     newMinRes = [ ];
     n = Length(minRes);
     i = 0;
     while (i < n ) {
       base = minRes[i];
       if (base == [ ]) {
         i = n; /* break; */
       }else{
         newMinRes = Append(newMinRes,base);
       }
       i++;
     }
     return(newMinRes);
   }
   
   def testAnnfs2(f) {
     local a,i,n;
     a = Sannfs2(f);
     b=a[0];
     n = Length(b);
     Println("------ V-minimal free resolution -----");
     sm1_pmat(b);
     Println("----- Is it complex?  ---------------");
     for (i=0; i<n-1; i++) {
       Println(b[i+1]*b[i]);
     }
     return(a);
   }
   def testAnnfs3(f) {
     local a,i,n;
     a = Sannfs3(f);
     b=a[0];
     n = Length(b);
     Println("------ V-minimal free resolution -----");
     sm1_pmat(b);
     Println("----- Is it complex?  ---------------");
     for (i=0; i<n-1; i++) {
       Println(b[i+1]*b[i]);
     }
     return(a);
   }
   
   def ToString_array(p) {
     local ans;
     if (IsArray(p)) {
       ans = Map(p,"ToString_array");
     }else{
       ans = ToString(p);
     }
     return(ans);
   }
   
   /* sm1_res_div([[x],[y]],[[x^2],[x*y],[y^2]],[x,y]): */
   
   def sm1_res_div(I,J,V) {
     I = ToString_array(I);
     J = ToString_array(J);
     V = ToString_array(V);
     sm1(" [[ I J]  V ] res*div /FunctionValue set ");
   }
   
   /* It has not yet been working */
   def sm1_res_kernel_image(m,n,v) {
     m = ToString_array(m);
     n = ToString_array(n);
     v = ToString_array(v);
     sm1(" [m n v] res-kernel-image /FunctionValue set ");
   }
   def Skernel(m,v) {
     m = ToString_array(m);
     v = ToString_array(v);
     sm1(" [ m v ] syz /FunctionValue set ");
   }
   
   def test3() {
     local a1,a2,b1,b2;
     a1 = Sannfs3("x^3-y^2*z^2");
     a1 = a1[0];
     a2 = Sannfs3_laScala2("x^3-y^2*z^2");
     a2 = a2[0];
     b1 = a1[1];
     b2 = a2[1];
     sm1_pmat(b2);
     Println("  OVER ");
     sm1_pmat(b1);
     return([sm1_res_div(b2,b1,["x","y","z"]),b2,b1,a2,a1]);
   }
   
   def test4() {
     local a,b;
     a = Sannfs3_laScala2("x^3-y^2*z^2");
     b = a[0];
     sm1_pmat( sm1_res_kernel_image(b[0],b[1],[x,y,z]));
     sm1_pmat( sm1_res_kernel_image(b[1],b[2],[x,y,z]));
     return(a);
   }
   
   def sm1_gb(f,v) {
     f =ToString_array(f);
     v = ToString_array(v);
     sm1(" [f v] gb /FunctionValue set ");
   }
   
   
   def SisComplex(a) {
     local n,i,j,k,b,p,q;
     n = Length(a);
     for (i=0; i<n-1; i++) {
       if (Length(a[i+1]) != 0) {
         b = a[i+1]*a[i];
         p = Length(b); q = Length(b[0]);
         for (j=0; j<p; j++) {
           for (k=0; k<q; k++) {
             if (!IsZero(b[j,k])) {
                Print("Is is not complex at ");
                Println([i,j,k]);
                return(false);
             }
           }
         }
       }
     }
     return(true);
   }
   
   def IsExact_h(c,v) {
     local a;
     v = ToString_array(v);
     a = [c,v];
     sm1(a," isExact_h /FunctionValue set ");
   }
   HelpAdd(["IsExact_h",
   ["IsExact_h(complex,var): bool",
    "It checks the given complex is exact or not in D<h> (homogenized Weyl algebra)",
    "cf. ReParse"
   ]]);
   
   def ReParse(a) {
     local c;
     if (IsArray(a)) {
       c = Map(a,"ReParse");
     }else{
       sm1(a," toString . /c set");
     }
     return(c);
   }
   HelpAdd(["ReParse",
   ["Reparse(obj): obj",
    "It parses the given object in the current ring.",
    "Outputs from SlaScala, Sschreyer may cause a trouble in other functions,",
    "because it uses the Schreyer order.",
    "In this case, ReParse the outputs from these functions.",
    "cf. IsExaxt_h"
   ]]);
   
   def ScheckIfSchreyer(s) {
     local ss;
     sm1(" (report) (grade) switch_function /ss set ");
     if (ss != "module1v") {
        Print("ScheckIfSchreyer: from "); Println(s);
        Error("grade is not module1v");
     }
     /*
     sm1(" (report) (mmLarger) switch_function /ss set ");
     if (ss != "tower") {
        Print("ScheckIfSchreyer: from "); Println(s);
        Error("mmLarger is not tower");
     }
     */
     sm1(" [(Schreyer)] system_variable (universalNumber) dc /ss set ");
     if (ss != 1) {
        Print("ScheckIfSchreyer: from "); Println(s);
        Error("Schreyer order is not set.");
     }
     /* More check will be necessary. */
     return(true);
   }
   
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