如果由任意元素所產生的次代數符合結合律,這個代數就是擁有冪結合性。元素x能夠多次自乘並不在乎到達了什麼冪數。例如x(x(xx)) = (x(xx))x = (xx)(xx). 以下結合律方式更為強烈:
代數中每個x,
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