What do Frobenius's, Solomon's, and Iwasaki's theorems on divisibility in groups have in common?
Abstract
Our result contains as special cases the Frobenius theorem (1895) on the number of solutions to the equation xn=1 in a group, the Solomon theorem (1969) on the number of solutions in a group to a system of equations having fewer equations than unknowns, and the Iwasaki theorem (1985) on roots of subgroups. There are other curious corollaries on groups and rings.
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