00732nam a2200193Ia 4500082002100000100001700021245008100038260003600119300001600155500008400171500000500255690000600260700000500266952011800271952010500389964001700494921001000511999001700521  a515.73bSi617.BA  aSinger, Ivan  aBest approximation in normed linear spaces by elements of linear subspacesb  aNew YorkbSpringer-Verlagc1970  a415p. Index  a(Die Grundlehran der mathematischen Wissenschaften in Einzeldarstellungen, 171)  a  a   a  00104070aISIbISId1998-09-16l1m2o515.73 Si617.BApDP14312r2022-02-10 00:00:00s2021-11-10w2019-02-14yBK  001040708GRaISIbISId1998-09-16l0o515.73 Si617.BApG1448r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a11333  c11333d11333