In the mathematical subject of group theory, **small cancellation theory** studies groups given by group presentations satisfying **small cancellation conditions**, that is where defining relations have "small overlaps" with each other. Small cancellation conditions imply algebraic, geometric and algorithmic properties of the group. Finitely presented groups satisfying sufficiently strong small cancellation conditions are word hyperbolic and have word problem solvable by **Dehn's algorithm**. Small cancellation methods are also used for constructing Tarski monsters, and for solutions of Burnside's problem.

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