Homotopy cartesian squares in extriangulated categories
Abstract
Let (C,E,s) be an extriangulated category. Given a composition of two commutative squares in C, if two commutative squares are homotopy cartesian, then their composition is also a homotopy cartesian. This covers the result by Mac Lane (1998) for abelian categories and the result by Christensen and Frankland (2022) for triangulated categories.
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