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math.AP2026

Mixed local-nonlocal quasilinear problems with mixed interpolated Hardy potential

Yergen Aikyn, Sekhar Ghosh, Vishvesh Kumar +1

This paper addresses the existence of nontrivial solutions to a class of mixed local-nonlocal problems involving a mixed interpolated Hardy potential. We first establish a concentr…

math.AP2026

Spectral analysis, maximum principles and shape optimization for nonlinear superposition operators of mixed fractional order

Yergen Aikyn, Sekhar Ghosh, Vishvesh Kumar +1

The main objective of this paper is to investigate the spectral properties, maximum principles, and shape optimization problems for a broad class of nonlinear ``superposition opera…

math.AP2026

Kernel estimates and weak (1,1)-boundedness of pseudo-differential operators on compact Lie groups

Duván Cardona, Rafik Yeghoyan, Michael Ruzhansky

Given a compact Lie group and its unitary dual , we establish the weak (1,1) continuity for pseudo-differential operators in the global Hörmander classes of order…

math.AP2026

The weak (1,1) boundedness of Fourier integral operators with complex phases

Duván Cardona, Michael Ruzhansky

Let be a Fourier integral operator of order associated with a canonical relation locally parametrised by a real-phase function. A fundamental result due to Seeger, S…

math.AP2025

Brezis-Nirenberg type problems associated with nonlinear superposition operators of mixed fractional order

Yergen Aikyn, Sekhar Ghosh, Vishvesh Kumar +1

This paper aims to study the Brezis-Nirenberg type problem driven by the nonlinear superposition of operators of the form w…