TY - BOOK AU - Butzer P L ed. ED - Proceedings of Linear Spaces and Approximation( 1977 : Oberwolfach ) ED - Proceedings of Linear Spaces and Approximation TI - Linear spaces and approximation: proceedings U1 - 515.7 PY - 1978/// CY - Basel PB - Birkhauser Verlag KW - Calculus KW - Functional analysis ER -