GEORGIAN MATHEMATICAL JOURNAL, cilt.28, sa.2, ss.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 = (H-n) is a sequence of R-linear maps H-n : C-n -> 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 to D has a groupoid structure with crossed complex morphisms as objects and homotopies as morphisms.