Lagrange's theorem (group theory) facts for kids
Lagrange's theorem in group theory states if G is a finite group and H is a subgroup of G, then |H| (how many elements are in H, called the order of H) divides |G|. Moreover, the number of distinct left (right) cosets of H in G is |G|/|H|.
Applications
- For any g in a group G, for some k that divides the |G|
- Any group of prime order cyclic (Any element in G can be created by a single element) and simple (no normal subgroups that aren't trivial)
See also
In Spanish: Teorema de Lagrange (teoría de grupos) para niños
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