PageHeader : Funkcialaj Ekvacioj, 21 (1978), 151-192 Title : Pseudo-Differential Operators with Non-Regular Symbols Title : and Applications AuthorInfo : By AuthorInfo : Hitoshi KUMANO-GO and Michihiro NAGASE AuthorInfo : (Osaka University, Japan) section : Introduction. section : 1. Approximation theory section : 2. $L^{\mathrm{p}}$ -boundedness of pseudo-differential operators section : 3. A sharp form of Garding's inequality section : 4. Fundamental solution of a hyperbolic operator section : 5. Lax-Nirenberg theorem for pseudo-difference operators section : References