In an addition operation, a number or quantity added to the augend. 在加法運算中，加到被加數上的數或量。
If a monogenic semigroup is infinite then it is isomorphic to the semigroup of positive integers with the operation of addition. 如果單基因半群是無(wú)限的，則它同構于帶有加法運算的正整數的半群。
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