Bounded and unbounded polynomials and multilinear forms: Characterizing continuity

Details Bounded and unbounded polynomials and multilinear forms: Characterizing continuity Bounded and unbounded polynomials and multilinear forms: Characterizing continuity

2011-05-09

arxiv.org/abs/1105.1737v1

Mathematics

Functional Analysis

8 pages

Scientific paper

In this paper we prove a characterization of continuity for polynomials on a normed space. Namely, we prove that a polynomial is continuous if and only if it maps compact sets into compact sets. We also provide a partial answer to the question as to whether a polynomial is continuous if and only if it transforms connected sets into connected sets. These results motivate the natural question as to how many non-continuous polynomials there are on an infinite dimensional normed space. A problem on the \emph{lineability} of the sets of non-continuous polynomials and multilinear mappings on infinite dimensional normed spaces is answered.

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