noun
submodule
Mathematical term in abstract algebra; a subset of a module that is itself a module under the same operations.
See also: 加群
環上の加群の部分加群を考える。
Consider a submodule of a module over a ring.
加群 is a module; 部分加群 is a submodule, a subset that is itself a module.
Compound of 部分 (ぶぶん, 'part') and 加群 (かぐん, 'module'), a direct translation of the mathematical term 'submodule'.