A sectiontheorem, a minimax inequality and a generalized fixed point theorem where the underlying space is a product space of two topological vector Spaces, are given.
给出了两个拓扑向量空间的乘积空间上截口定理，极小极大不等式及一个推广的不动点定理。
2
Based on shearing stress Theorem, we know that the shearing stress direction of all the spots on the edge of circular cross-section should be tangent to the circle.