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Lagrange theorem
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In this video I show you how the set that makes up a group can be partitioned by a subgroup and its cosets. I also take a look at the implication this has for the cardinality of a subgroup (Lagrange's theorem) and how this pertains to the cyclic group formed by an element of the group. This leads us to an isomorphism between a group with prime number cardinality and a cyclic group with the same number of elements.