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Homological dimensions for endomorphism algebras of Gorenstein projective modules

Aiping ZhangXueping Lei — 2024

Czechoslovak Mathematical Journal

Let A be a CM-finite Artin algebra with a Gorenstein-Auslander generator E , M be a Gorenstein projective A -module and B = End A M . We give an upper bound for the finitistic dimension of B in terms of homological data of M . Furthermore, if A is n -Gorenstein for 2 n < , then we show the global dimension of B is less than or equal to n plus the B -projective dimension of Hom A ( M , E ) . As an application, the global dimension of End A E is less than or equal to n .

Regularizing effect of the interplay between coefficients in some noncoercive integral functionals

Aiping ZhangZesheng FengHongya Gao — 2024

Czechoslovak Mathematical Journal

We are interested in regularizing effect of the interplay between the coefficient of zero order term and the datum in some noncoercive integral functionals of the type 𝒥 ( v ) = Ω j ( x , v , v ) d x + Ω a ( x ) | v | 2 d x - Ω f v d x , v W 0 1 , 2 ( Ω ) , where Ω N , j is a Carathéodory function such that ξ j ( x , s , ξ ) is convex, and there exist constants 0 τ < 1 and M > 0 such that | ξ | 2 ( 1 + | s | ) τ j ( x , s , ξ ) M | ξ | 2 for almost all x Ω , all s and all ξ N . We show that, even if 0 < a ( x ) and f ( x ) only belong to L 1 ( Ω ) , the interplay | f ( x ) | 2 Q a ( x ) implies the existence of a minimizer u W 0 1 , 2 ( Ω ) which belongs to L ( Ω ) .

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