00397nam a2200145   450000100060000000300030000600500170000900800410002603500190006703500180008605000200010410000210012424500720014526000340021721427UR20220427165225.0061103|||||||||||||||||||||||||||||||| d  a(janium) 21416  a(janium)21415 4aQA37b.C68 19561 aCourant, Richard10aWhat is mathematicsb : an elementary approach to ideas and methods  bOxford University Pressc1956