commutative operation

... "可交换矩阵"," commutative matrix" "可交换操作"," commutative operation" "可交换运算子"," commutative operator" ...

用交换运算( commutative operation ) 加法和乘法都是交换运算 即a b = b a a×b = b×a 但减法和除法不是交换运算 必须注意的 …