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math.AP2026
Rigidity for two-phase overdetermined problems in
Andrea Bisterzo, Shigeru Sakaguchi
In this paper, we study rigidity phenomena associated with a class of overdetermined two-phase problems on the -dimensional sphere . Specifically, we analyze the s…
math.AP2026
On the stability of eigenvalues of varying bilinear forms in abstract Hilbertian settings and applications
Andrea Bisterzo, Roberto Ognibene, Prasun Roychowdhury +1
The aim of the present paper is to develop a spectral perturbation theory from a higher perspective. More precisely, we consider a one-parameter family of varying bilinear forms, e…