000 00260nam a2200109 4500
008 160616s 000 0
245 _aMathematical discovery, v.2
100 _aPolya, George
500 _aB k2.1 k2.1; k2.2
942 _cBK
_2BK2139
080 _a51 POL
999 _c2139
_d2139