We investigated the multiplicity of periodic solutions for parameterized systems coupling asymmetric components and linear components, where the nonlinearity is allowed to be sign-changing. Our approach was based on an extended version of the Poincaré-Birkhoff theorem, a rotation number approach, and a new existence result.
Citation: Haihua Lu, Tianjue Shi. Multiple periodic solutions of parameterized systems coupling asymmetric components and linear components[J]. AIMS Mathematics, 2025, 10(4): 8988-9010. doi: 10.3934/math.2025412
We investigated the multiplicity of periodic solutions for parameterized systems coupling asymmetric components and linear components, where the nonlinearity is allowed to be sign-changing. Our approach was based on an extended version of the Poincaré-Birkhoff theorem, a rotation number approach, and a new existence result.
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