其次，讨论模糊集乘积的性质；

Secondly, the property of the fuzzy sets product is discussed.

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然后根据扩张原理，在模糊集乘积同态、同构映射的条件下，研究模糊集乘积与模糊集乘积同态像之间的关系。

Then, based on the extension principle, the relations between fuzzy sets product and the homomorphic images of the fuzzy sets product are studied.

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因此， 连接行集数是两个行集的行集数的乘积，被选择的谓词连接的乘积。

Therefore, the join cardinality is the product of the cardinalities of two row sets, multiplied by the selectivity of the join predicate.

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