Displaying similar documents to “A note on finite codimensional linear isometries of C ( X ) into C ( Y ) .”

On some properties of quotients of homogeneous C(K) spaces

Artur Michalak (2016)

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

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We say that an infinite, zero dimensional, compact Hausdorff space K has property (*) if for every nonempty open subset U of K there exists an open and closed subset V of U which is homeomorphic to K. We show that if K is a compact Hausdorff space with property (*) and X is a Banach space which contains a subspace isomorphic to the space C(K) of all scalar (real or complex) continuous functions on K and Y is a closed linear subspace of X which does not contain any subspace isomorphic...

Relatively open operators and the ubiquitous concept.

R. W. Cross (1994)

Publicacions Matemàtiques

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A linear operator T: D(T) ⊂ X → Y, when X and Y are normed spaces, is called (UO) if every infinite dimensional subspace M of D(T) contains another such subspace N for which T|N is open (in the relative sense). The following properties are shown to be equivalent: (i) T is UO, (ii) T is ubiquitously almost open, (iii) no infinite dimensional restriction of T is injective and precompact, (iv) either T is upper semi-Fredholm or T has finite dimensional range, (v) for each infinite dimensional...