00328nam a2200121 a 450000500170000002000150001708200130003210000130004524500370005825000130009526000720010830000260018020251203111105.0  a007043476X  a511bLIU  aLiu, C.L  aElements of Discrete Mathematics  a2nd Edn.  aNew DelhibTata McGraw-Hill Publishing Company Ltd.,c1985 - R 2007  axiv, 433p.c22 cmbPB