群的直和 Direct sum of groups

拓扑直和 [数] topological direct sum

环的直和 [数] direct sum of rings

弱直和 weak direct sum

直和分解 decomposition in a direct sum ; [数] direct sum decomposition ; Direct decomposition ; direct sum operator

外直和 external direct sum

次直和 subdirect sum

向量空间直和 vector space direct sum

正直和诚实 Integrity&Honesty