00326nam a2200133Ia 450000500170000000800410001704100080005808200130006610000220007924500280010126000380012930000090016765000160017620250729165802.0250729s2018    xx            000 0 und d  aeng  a510 BHAP  aBharathiy Khasnis  aPedagogy of Mathematics  aNew DelhibA P H PUBLISHINGc2018  a170p  aMathematics