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A note on bump functions that locally depend on ...
We show that if a continuous bump function on a Banach space X locally depends on finitely ... Some corollaries for Markusevic bases and Asplund spaces are.
BULL. AUSTRAL. MATH. SOC.
VOL. 56 (1997)
46B03,46B20
[447-451]
A NOTE ON BUMP FUNCTIONS THAT LOCALLY DEPEND ON FINITELY MANY COORDINATES M. FABIAN AND V. ZIZLER
We show that if a continuous bump function on a Banach space X locally depends on finitely many elements of a set F in X*, then the norm closed linear span of F equals to X". Some corollaries for Markusevic bases and Asplund spaces are derived. Real valued functions with bounded nonempty support (bump functions in short) are important in analysis on Banach spaces. Bump functions that locally depend on finitely many coordinates play an important role in Banach space theory (see for example, [1]). The main result of this note is related to the Bishop-Phelps theorem on the density of norm attaining functionals. DEFINITION 1: Let F be a set in X*. A function tp that maps a Banach space X into R U +oo and is such that the set {x £ X; (f(x) < +00} is open is said to locally depend on finitely many elements of F if for every x £ X, where tp(x) < +00 there is a neighbourhood U of x in X, a finite collection {/i,/2, • • • , / n } in F and a continuous real valued function tp on R" such that