一个二重傅里叶级数的收敛性

Budget Set of NA-Equilibrium and Stiefel Manifold

对任意以２π为周期的连续函数ｆ（ｘ，ｙ），本文构造了一个二重傅里叶级数，它在全平面上一致地收敛于ｆ（ｘ，ｙ）．

This paper give an expression of budget set of no-arbitrage equilibrium by the stiefel manifold for the sake of orientation of equilibrium and construction of oriented index theorem.