Left Coset Sign Video
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Definition
If H is a subgroup of a group G and a is an element of G, the notation aH will stand for the set of all products ah with h in H: aH={g in G|g=ah for some h in H}. This set is called a left coset of H in G, the word "left" referring to the fact that the element a appears on the left.
Source: Algebra, second edition by Michael Artin
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