Crossed corner of algebras and related structures

This master thesis entitled "Crossed Corner of Algebras and Related Structures" consists of three chapters. In the first chapter, definitions of commutative algebras action, crossed modules are given, propositions are proven and examples are presented regarding their structures. In the second chapter, by defining the crossed corner for commutative algebras, it has been shown that their actions are well defined. Moreover, it has been shown how bisimplicial algebras model the concept of crossed corners. In the last section, the results obtained are given and suggestions are made for individuals who want to work on this subject in the future. Keywords: Bisimplicial Algebra, Crossed Corner, Crossed Module, Moore Bicomplex