ABSTRACT.Formal deformations (expansions and collapses) of dimension <, 3 among 2-dimensional polyhedra are explained in terms of a certain collection of operations on finite group presentations. The results are valid for any simple homotopy type of 2-dimensional polyhedra, and simplifications are possible within the simply connected simple homotopy types.
ABSTRACT.Formal deformations (expansions and collapses) of dimension <, 3 among 2-dimensional polyhedra are explained in terms of a certain collection of operations on finite group presentations. The results are valid for any simple homotopy type of 2-dimensional polyhedra, and simplifications are possible within the simply connected simple homotopy types.
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