The orbit-stabilizer theorem is a fundamental result in group theory that relates the size of an orbit of an element under a group action to the size of the stabilizer subgroup of that element. Essentially, it states that for a finite group acting on a set, the size of the orbit of an element times the size of its stabilizer equals the size of the group. This concept is crucial for understanding how groups interact with various structures and leads to powerful counting results in combinatorial problems.
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