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Noun
1. subgroupMathematics
Wikipedia definition
2. SubgroupIn group theory, given a group G under a binary operation *, a subset H of G is called a subgroup of G if H also forms a group under the operation *. More precisely, H is a subgroup of G if the restriction of * to H x H is a group operation on H. This is usually represented notationally by H ≤ G, read as "H is a subgroup of G". A proper subgroup of a group G is a subgroup H which is a proper subset of G (i.e. H ≠ G).
Read “Subgroup” on English Wikipedia
Read “部分群” on Japanese Wikipedia
Read “Subgroup” on DBpedia

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