点积和矩阵。阅读第三章至3.7以及做练习题。
The dot product and matrices. Read Chapter3 through3.7 and do exercises.
最后，给出模糊理想的积和模糊同余关系的积的概念，讨论了它们的一些性质。
Finally, we give the concepts of the product of fuzzy ideals and the product of fuzzy congruence relations. Some properties of them are discussed.
大洋板块俯冲有俯冲加积和俯冲侵蚀两种不同的构造作用，它可在不同的时间-空间相互转化。
The subduction of oceanic plates has two tectonic actions of subduction accretion and subduction erosion, which ar interconvertible in different time and space.
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