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coset

[ koh-set ]
/ ˈkoʊ sɛt /
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noun Mathematics.

a subset of a group, formed by the consistent operation of a given element of the group on the left or right of all the elements of a subgroup of the group.

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Origin of coset

First recorded in 1925–30; co- + set
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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