"Mondai kaiketsu." . . "問題解決." . . . . . . . . "Eregantona mondai kaiketsu : Jūnanna hassō o hikidasu sensu to waza"@ja . "エレガントな問題解決 : 柔軟な発想を引き出すセンスと技" . . "Ereganto na mondai kaiketsu : jūnan na hassō o hikidasu sensu to waza" . . . . "art and craft of problem solving.2nd ed"@ja . . . . "Sūgaku." . . "数学" . "数学." .