Pullback diagrams, syzygy finite classes and Igusa-Todorov algebras

Diego Bravo, Marcelo Lanzilotta, Octavio Mendoza

For an abelian category $\mathcal{A}$, we define the category PEx($\mathcal{A}$) of pullback diagrams of short exact sequences in $\mathcal{A}$, as a subcategory of the functor cat…