A conjugacy class in group theory is a set of elements in a group that are related to each other by conjugation. Specifically, if an element 'g' can be transformed into another element 'h' by an inner automorphism, i.e., there exists an element 'x' in the group such that 'h = xgx^{-1}', then 'g' and 'h' belong to the same conjugacy class. This concept is crucial as it helps in understanding the structure of groups, particularly in relation to normal subgroups and representation theory.
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