Singer, Ivan The theory of best approximation and functional analysis / Ivan Singer. - 1a ed. - Philadelphia : Society for Industrial and Applied Mathematics, 1974 - vii, 95 p. ; 25 cm. - Regional Conference Series in Applied Mathematics ; 13 . Bibliografía : p. 85-92 Subjects--Topical Terms: Análisis funcionalTeoría de la aproximación LC Class. No.: QA320 / S56 1974