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Tensor products of higher almost split sequences in subcategories

Xiaojian LuDeren Luo — 2023

Czechoslovak Mathematical Journal

We introduce the algebras satisfying the ( , n ) condition. If Λ , Γ are algebras satisfying the ( , n ) , ( , m ) condition, respectively, we give a construction of ( m + n ) -almost split sequences in some subcategories ( ) ( i 0 , j 0 ) of mod ( Λ Γ ) by tensor products and mapping cones. Moreover, we prove that the tensor product algebra Λ Γ satisfies the ( ( ) ( i 0 , j 0 ) , n + m ) condition for some integers i 0 , j 0 ; this construction unifies and extends the work of A. Pasquali (2017), (2019).

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