00303nam a2200109 a 450000500170000002000150001708200200003210000200005224500620007226000390013430000200017320251203092002.0  a8120302621  a530.15,bD, har  aHarper, Charlie  aIntroduction to mathematical physics, Charlie Harper, eng  aNew Delhi, Prentice-Hall, Inc1995  axvi,301p.c22cm