01190cam0-22003851i-450-99000126811040332120051114113521.00-306-30751-0000126811FED01000126811(Aleph)000126811FED0100012681120001205d1973----km-y0itay50------baengUSy-------001yySecond order equations with nonnegative characteristic formO. A. Oleinik and E. V. Radkevictranslated from Russian by Paul C. FifeProvidenceAmerican Mathematical Society1973VII, 259 p.25 cmEquazioni differenziali alle derivate parziali515.353Oleinik,O.A.335063Radkevic,E.V.335064File,Paul C.ITUNINARICAUNIMARCBK9900012681104033216-M-1815520MA104 012-23IRC 395/LDINCH02 30 E 161884FINBNMA1DINCHFINBNSecond order equations with nonnegative characteristic form380209UNINA