Proof of Lemma and Lagrange's Theorem

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Proof of Lemma and Lagrange's Theorem. This video starts by proving that any two right cosets have the same cardinality. Then we prove Lagrange's Theorem which says that if H is a subgroup of a finite group G then the order of H divides the order of G. We also define the index of H in G as the number of distinct right cosets of H in G.

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beautiful proof, but we haven't prove the group can be partitioned by coset yet, does it make sense?

jackliyong

Absolute amazing proof, easy to understand and every arugment in place, great help before my exam :)

Bidoof-ukgw

How to proof the Lagrange‘s theorem infinite version？

maxc

What is the difference between a Lemma and a Theorem?

anshumanagrawal

You made the proof so simple and understanding

sylvesterpromise

these videos skip some steps and assumes a little too much prior knowledge imo. i could have used a little more explanation, not bare narration

selimcanpolat

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