This provides a solution for the restricted Burnside problem for the case of prime exponent . ( Later in 1989 Efim Zelmanov was able to solve the restricted Burnside problem for an arbitrary exponent . ) Issai Schur had showed in 1911 that any finitely generated periodic group that was a subgroup of the group of invertible " n " ?" n " complex matrices was finite; he used this theorem to prove the Jordan Schur theorem.
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