This paper gives
necessary and sufficient conditions for a triple (X,M,Γ) to have property SAIN
(simultaneous approximation and interpolation which preserves the norm), X
being an arbitrary Banach space. The best previous result concerned X, a
reflexive, rotund Banach space. The paper proceeds to use this result to yield
geometric proofs of the work of D. J. Johnson concerning property SAIN and
C[a,b].
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