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6.25 (1978)

Solved

(Well-known problem). Find an algorithm for calculating the rank of coefficient-free equations in a free group. The rank of an equation is the maximal rank of the free subgroup generated by a solution of this equation.

Contributor: G. S. Makanin

Progress

This was found (A. A. Razborov, Math. USSR–Izv., 25 (1984), 115–162).

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