China
In this paper, we consider a class of nonlinear beam equations on flat tori Td L, utt + 2u = (−)α f (ωt, x, (−)βu), 0 < α + β ≤ 1 and prove that the equation admits many quasi-periodic solutions with the non-resonant frequencies ω. The main proof is based on an abstract Nash-Moser type implicit function theorem developed in Berti and Bolle (Nonlinearity 25(9):2579–2613, 2012;
J Eur Math Soc 15(1):229–286, 2013).
© 2008-2024 Fundación Dialnet · Todos los derechos reservados