它是纯对称的积；因此，它是完全可交换的。

It is the purely symmetric product; therefore, it is completely commutative.

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但它并不能交易给第三方，也就不完全是种可交换的资产。

But it cannot be traded to third parties, and it is not entirely fungible.

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介绍弱左正则幺半群的概念，指出在可交换半群中，完全正则、弱左(右)正则和完全幂等是等价的。

In this paper, we introduce the notion of left weakly regular semigroup and show that in a commutative semigroup, the complete regularity, regularity, left resp.

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