Application of a lemma on bilinear forms to a problem in nonlinear oscillations

Lazer, A. C.

doi:10.1090/S0002-9939-1972-0293179-9

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ISSN 1088-6826(online) ISSN 0002-9939(print)

Application of a lemma on bilinear forms to a problem in nonlinear oscillations

Author: A. C. Lazer
Journal: Proc. Amer. Math. Soc. 33 (1972), 89-94
MSC: Primary 34C15
MathSciNet review: 0293179
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Abstract: In this note we give a simple condition for nondegeneracy of symmetric bilinear forms on infinite dimensional vector spaces. We apply this condition and elementary properties of Fourier series to prove a uniqueness theorem for periodic solutions of a class of second order nonlinear differential systems.

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