000 004510000a22001570004500
008 140223b1972 xxu||||| |||| 00| 0 eng d
041 _aENG
080 _aB334 L2
082 _aB334 L2
245 _aLinear mathematics 23: Wave equations 24: Orthogonal and symmetric transformations
260 _aBletchley
_bOpen Univ. Pr.
_c1972
440 _aOpen University, M201, 23-24
500 _aB25,1
650 _aPARTIAL
906 _aOPEN UNIVERSITY
999 _c253898
_d253898