This paper offers two methods to verify the associativelaw.
本文给出了两个检验结合律的方法。
2
Here we have used the associativelaw or the cancellation law for multiplication, which are satisfied for natural Numbers, now we assume they are satisfied with fraction Numbers.
We then can verify the associativelaw and the commutative law for multiplication, and the uniqueness of the result of addition indicates the uniqueness and the cancellation law for multiplication.