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Extension of polynomials defined on subspaces

Published online by Cambridge University Press:  16 March 2010

Centro de Investigación en Matemáticas (CIMAT), A.P. 402, Guanajuato, 36000, Gto., Mexico. e-mail:
Departamento de Análisis Matemático, Facultad de Ciencias Matemáticas, Universidad Complutense de Madrid, 28040 Madrid, Spain. e-mail:


Let k ∈ ℕ and let E be a Banach space such that every k-homogeneous polynomial defined on a subspace of E has an extension to E. We prove that every norm one k-homogeneous polynomial, defined on a subspace, has an extension with a uniformly bounded norm. The analogous result for holomorphic functions of bounded type is obtained. We also prove that given an arbitrary subspace FE, there exists a continuous morphism φk, F: (kF) → (kE) satisfying φk, F(P)|F = P, if and only E is isomorphic to a Hilbert space.

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Copyright © Cambridge Philosophical Society 2010

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