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Diff for /OpenXM/src/k097/lib/minimal/minimal.k between version 1.4 and 1.18

version 1.4, 2000/05/04 11:05:20 version 1.18, 2000/07/30 02:26:25
Line 1 
Line 1 
 /* $OpenXM: OpenXM/src/k097/lib/minimal/minimal.k,v 1.3 2000/05/04 06:55:28 takayama Exp $ */  /* $OpenXM: OpenXM/src/k097/lib/minimal/minimal.k,v 1.17 2000/07/26 12:56:36 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),
    make a symbolic link by the command     make a symbolic link by the command
    ln -s /usr/bin/cpp /lib/cpp     ln -s /usr/bin/cpp /lib/cpp
 */  */
   #define OFFSET 0
   /* #define OFFSET 20*/
 /* Test sequences.  /* Test sequences.
    Use load["minimal.k"];;     Use load["minimal.k"];;
   
Line 34  def load_tower() {
Line 36  def load_tower() {
     sm1(" [(parse) (k0-tower.sm1) pushfile ] extension ");      sm1(" [(parse) (k0-tower.sm1) pushfile ] extension ");
     sm1(" /k0-tower.sm1.loaded 1 def ");      sm1(" /k0-tower.sm1.loaded 1 def ");
   }    }
     sm1(" oxNoX ");
 }  }
 load_tower();  load_tower();
 SonAutoReduce = true;  SonAutoReduce = true;
Line 128  sm1(" [(AvoidTheSameRing)] pushEnv 
Line 131  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 148  def SresolutionFrameWithTower(g,opt) {
Line 163  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 188  def SresolutionFrameWithTower(g,opt) {
Line 208  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 287  def Sres0FrameWithSkelton(g) {
Line 308  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 336  def test_SinitOfArray() {
Line 360  def test_SinitOfArray() {
   
 /* f is assumed to be a monomial with toes. */  /* f is assumed to be a monomial with toes. */
 def Sdegree(f,tower,level) {  def Sdegree(f,tower,level) {
   local i;    local i,ww, wd;
     /* extern WeightOfSweyl; */
     ww = WeightOfSweyl;
     f = Init(f);
   if (level <= 1) return(StotalDegree(f));    if (level <= 1) return(StotalDegree(f));
   i = Degree(f,es);    i = Degree(f,es);
   return(StotalDegree(f)+Sdegree(tower[level-2,i],tower,level-1));    return(StotalDegree(f)+Sdegree(tower[level-2,i],tower,level-1));
   
 }  }
   
 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++) {
     n = Length(tower[i]);      n = Length(tower[i]);
     ans_at_each_floor=NewArray(n);      ans_at_each_floor=NewArray(n);
     for (j=0; j<n; j++) {      for (j=0; j<n; j++) {
       ans_at_each_floor[j] = Sdegree(tower[i,j],tower,i+1)-(i+1);        ans_at_each_floor[j] = Sdegree(tower[i,j],tower,i+1)-(i+1)
                               + OFFSET;
       /* Println([i,j,ans_at_each_floor[j]]); */        /* Println([i,j,ans_at_each_floor[j]]); */
     }      }
     ans[i] = ans_at_each_floor;      ans[i] = ans_at_each_floor;
Line 418  def SmaxOfStrategy(a) {
Line 451  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 426  def SlaScala(g) {
Line 459  def SlaScala(g) {
         reductionTable_tmp;          reductionTable_tmp;
   /* extern WeightOfSweyl; */    /* extern WeightOfSweyl; */
   ww = WeightOfSweyl;    ww = WeightOfSweyl;
   Print("WeghtOfSweyl="); 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 451  def SlaScala(g) {
Line 491  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 519  def SlaScala(g) {
Line 559  def SlaScala(g) {
     bases = Sbases_to_vec(bases,bettiTable[i]);      bases = Sbases_to_vec(bases,bettiTable[i]);
     freeResV[i] = bases;      freeResV[i] = bases;
   }    }
   return([freeResV, redundantTable,reducer,bettiTable,redundantTable_ordinary]);    return([freeResV, redundantTable,reducer,bettiTable,redundantTable_ordinary,rf]);
 }  }
   
 def SthereIs(reductionTable_tmp,strategy) {  def SthereIs(reductionTable_tmp,strategy) {
Line 559  def SnextI(reductionTable_tmp,strategy,redundantTable,
Line 599  def SnextI(reductionTable_tmp,strategy,redundantTable,
        }         }
      }       }
    }     }
      Print("reductionTable_tmp=");
    Println(reductionTable_tmp);     Println(reductionTable_tmp);
      Println("See also reductionTable, strategy, level,i");
    Error("SnextI: bases[i] or bases[j] is null for all combinations.");     Error("SnextI: bases[i] or bases[j] is null for all combinations.");
 }  }
   
Line 643  def MonomialPart(f) {
Line 685  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 679  def SpairAndReduction(skel,level,ii,freeRes,tower,ww) 
Line 727  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 712  def SpairAndReduction(skel,level,ii,freeRes,tower,ww) 
Line 762  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 825  def Sbases_to_vec(bases,size) {
Line 879  def Sbases_to_vec(bases,size) {
   return(newbases);    return(newbases);
 }  }
   
 def Sminimal(g) {  HelpAdd(["Sminimal",
   ["It constructs the V-minimal free resolution by LaScala'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 886  def Sminimal(g) {
Line 959  def Sminimal(g) {
       }        }
     }      }
    }     }
    return([Stetris(minRes,redundantTable),     tminRes = Stetris(minRes,redundantTable);
           [ minRes, redundantTable, reducer,r[3],r[4]],r[0]]);     return([SpruneZeroRow(tminRes), tminRes,
             [ minRes, redundantTable, reducer,r[3],r[4]],r[0],r[5]]);
   /* r[4] is the redundantTable_ordinary */    /* r[4] is the redundantTable_ordinary */
   /* r[0] is the freeResolution */    /* r[0] is the freeResolution */
     /* r[5] is the skelton */
 }  }
   
   
Line 1021  def Sannfs(f,v) {
Line 1096  def Sannfs(f,v) {
 def Sannfs2(f) {  def Sannfs2(f) {
   local p,pp;    local p,pp;
   p = Sannfs(f,"x,y");    p = Sannfs(f,"x,y");
   Sweyl("x,y",[["x",-1,"y",-1,"Dx",1,"Dy",1]]);    sm1(" p 0 get { [(x) (y) (Dx) (Dy)] laplace0 } map /p set ");
   pp = Map(p[0],"Spoly");    Sweyl("x,y",[["x",-1,"y",-1,"Dx",1,"Dy",1]]);
   return(Sminimal(pp));    pp = Map(p,"Spoly");
     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, 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]:"
   ]]);
   /* Some samples.
     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^3-y^2-x");
     a=Sannfs2("x*y*(x-y)");
   */
   
   
 def Sannfs3(f) {  def Sannfs3(f) {
   local p,pp;    local p,pp;
   p = Sannfs(f,"x,y,z");    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]]);    Sweyl("x,y,z",[["x",-1,"y",-1,"z",-1,"Dx",1,"Dy",1,"Dz",1]]);
   pp = Map(p[0],"Spoly");    pp = Map(p,"Spoly");
   return(Sminimal(pp));    return(Sminimal(pp));
 }  }
   
 /*  HelpAdd(["Sannfs3",
   The betti numbers of most examples are 2,1. (0-th and 1-th).  ["Sannfs3(f) constructs the V-minimal free resolution for the weight (-1,1)",
   a=Sannfs2("x*y*(x+y-1)"); ==> The betti numbers are 3, 2.   "of the Laplace transform of the annihilating ideal of the polynomial f in x,y,z.",
   a=Sannfs2("x^3-y^2-x");    : it causes an error. It should be fixed.   "See also Sminimal, Sannfs2.",
   a=Sannfs2("x*y*(x-y)");    : it causes an error. It should be fixed.   "Example: a=Sannfs3(\"x^3-y^2*z^2\");",
    "         b=a[0]; sm1_pmat(b);",
    "         b[1]*b[0]: b[2]*b[1]:"]]);
   
 */  
   
   
   /* 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 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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  Added in v.1.18
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