00305nam a2200121Ia 4500082002000000100002200020245003900042260003400081300001500115490004300130500000500173700000500178  a515.73bN119.EA  aNachbin, Leopoldo  aElements of approximation theoryb  aPrincetonbVan Nostrandc1967  axii, 119p.  aVan Nostrand Mathematical studiesv 14  a  a