在第四章和第五章中我们重点考虑正截面曲率的球面。
In chapter 4 and chapter 5 we focus on spheres with positive sectional curvatures.
利用数量曲率与第二基本形式长度之间的一个不等式关系，证明了其子流形的截面曲率一定非负(或者为正)，并将此应用到紧致子流形上，得到一些结果。
By using an inequality relation between a scalar curvature and the length of the second fundamental form, it is proved that sectional curvatures of a submanifold must be nonnegative (or positive).
最后对钢骨混凝土L形截面柱的屈服曲率及双向偏心受压正截面承载力计算方法进行了讨论。
Finally, it discusses the calculation methods of yield curvature and biaxial bending bearing capacity of the L-shaped cross-section steel reinforced concrete column.
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