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Using Gegenbauer polynomials and the zonal harmonic functions we build an explicit representation formula for the Green function with Neumann boundary conditions in the annulus. Keywords Green Function Neumann Boundary Conditions Annular Domain AMS Subject Classification 35B44 35B33 35J25 Rights and Permissions Open Access © 2026 Global Science Press All rights reserved · Permission required for reuse
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Giuseppe Mario Rago (2026) studied this question.
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