同调代数

It constructs the necessary and sufficient condition between the positive definiteness of homological quadratic and finite representation type.

最后构造遗传artin余代数上的同调二次型正定性与有限表示型之间的充分必要关系。

Chapter 1 is introduction.we introduce the importance of homological theory in Algebras, and the close relations with other algebraic branchs.

第一章为引言，主要介绍了同调理论在整个代数学中的重要位置以及与其它代数分支的密切联系。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。