00548nam a2200181Ia 4500082002100000100001700021245006300038260002900101300001400130490005900144500000500203690000600208700000500214952010300219964001700322921001000339999001700349  a515.73bSi617.TB  aSinger, Ivan  aThe theory of best approximation and functional analysisb  aPennsylvaniabSIAMc1974  avii, 95p.  aRegional conference series in Applied Mathematicsv 13  a  a   a  00104070aISIbISId1998-09-16l0o515.73 Si617.TBpDP16853r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a11334  c11334d11334