Isomorphism theorems
Theorem C (groups)

Let G {\displaystyle G} be a group, and N {\displaystyle N} a normal subgroup of G {\displaystyle G}.Then

The last statement is sometimes referred to as the third isomorphism theorem. The first four statements are often subsumed under Theorem D below, and referred to as the lattice theorem, correspondence theorem, or fourth isomorphism theorem.
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