Small cancellation theory is a branch of group theory that deals with the construction and analysis of groups based on certain combinatorial properties of their presentation. It was introduced primarily in the context of free groups and has significant implications for the study of group properties like growth, word problem, and the existence of certain types of subgroups. At its core, small cancellation theory involves analyzing groups presented by generators and relations in a way that ensures the relations do not impose too many restrictions on the group's structure.
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