Bounded and unbounded polynomials and multilinear forms: Characterizing continuity |
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Authors: | José L Gámez-Merino Gustavo A Muñoz-Fernández Daniel Pellegrino Juan B Seoane-Sepúlveda |
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Institution: | 1. Departamento de Análisis Matemático, Facultad de Ciencias Matemáticas, Plaza de Ciencias 3, Universidad Complutense de Madrid, Madrid 28040, Spain;2. Departamento de Matemática, Universidade Federal da Paraíba, 58.051-900 – João Pessoa, Brazil |
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Abstract: | 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 lineability of the sets of non-continuous polynomials and multilinear mappings on infinite dimensional normed spaces is answered. |
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