Crank conjecture
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"Crank (mathematics)" redirects here. For mathematical crankery, see Pseudomathematics.
In mathematics, the crank conjecture was a conjecture about the existence of the crank of a partition that separates partitions of a number congruent to 6 mod 11 into 11 equal classes. The conjecture was introduced by Dyson (1944) and proved by Andrews and Garvan (1987).