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normal series

American  

noun

Mathematics.

  1. a collection of subgroups of a given group so arranged that the first subgroup is the identity, the last subgroup is the group itself, and each subgroup is a normal subgroup of the succeeding subgroup.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.