Georgian Mathematical Journal, vol.28, no.2, pp.163-172, 2021 (SCI-Expanded)
In this study, given two crossed complexes C and D of associative R-algebras and a crossed complex morphism f:C→D, we construct a homotopy as a pair (H,f), where H=(Hn) is a sequence of R-linear maps Hn:Cn→Dn+1. Then we show that for a fixed pair C and D of crossed complexes of associative R-algebras, the family of all homotopies between crossed complex morphisms from C C to D has a groupoid structure with crossed complex morphisms as objects and homotopies as morphisms.