00423nam a2200133Ia 4500082002000000100002300020245007400043260002800117300002000145490005000165500000500215700003700220700003200257  a515.35bV287.DP  aVaradhan, S. R. S.  aDiffusion problems and partial differential equations; lectures on-b  aNew DelhibNarosac1980  aii, 315p. Bibl.  aTIFR lectures on Mathematics and Physicsv 64  a  aMuthuramalingam, PL. ; notes by-  aNanda, Tara R. ; notes by -