Multiplication and addition are associative operations.
乘法和加法是结合性运算。
Multiplication and addition are associative operations.
乘法和加法是结合性运算。
For nonassociative rings R with associative in the middle nucleus, R can be associative under some conditions.
摘要对结合子在中核心之非结合环R,在某些条件下R能够是结合的。
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