00278nam a22001217a 4500020001800000082001200018100001700030245003800047250001300085260002700098300001500125650001600140  a9788126527588  a511 GOS  aEric Gossett  aDiscrete mathematics with proof,   a2nd ed.   aNew DelhibWileyc2014  apv.bill.:  aMathematics