Given a 2-homogeneous polynomial P x, y s ax q by q cxy with real coeffi-5 5 5 5 cients, let P and P denote the norms of P on the real and complex Banach r c 2 5 5 5 5 space l , respectively. We show P s P , and obtain a sufficient and necessary r c 1 condition on the coefficients a, b, and c for P
Symmetric multilinear forms and polarization of polynomials
✍ Scribed by Aleš Drápal; Petr Vojtěchovský
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 229 KB
- Volume
- 431
- Category
- Article
- ISSN
- 0024-3795
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✦ Synopsis
We study a generalization of the classical correspondence between homogeneous quadratic polynomials, quadratic forms, and symmetric/alternating bilinear forms to forms in n variables. The main tool is combinatorial polarization, and the approach is applicable even when n! is not invertible in the underlying field.
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