Sem. on the Riemann Problem, Complete Integrability and Arith. Applications (1979-1980 : Inst. des hautes études scientifiques and Columbia Univ.) Sem. on the Riemann Problem, Complete Integrability and Arith. Applications, 1982 (a.e.) CIP t.p. (G. Chudnovsky) CIP galley (Gregory V. Chudnovsky, Dept. of Math., Columbia Univ.) CIP data sheet (b. 4/17/52)