semidirect product
plural of aganaine
plural of Arent
present participle of Röntgenize
(group theory) A generalisation of direct product such that, in one of two equivalent definitions, only one of the subgroups involved is required to be a normal subgroup.
その壁紙模様の対称群は、平行移動部分群と点群の半直積として表現できる。
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