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Index

  • Definition: Let H be a subgroup of the group G. If the collection G/H of right cosets of H is G is finite, the cardinality is called the index of H in G. The collection of left cosets of H in G has the same cardinality.

    Source: Topology (second edition) by James R. Munkres

  • Listed under: Abstract Algebra, Algebraic Topology

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