摘要：
Elementary inequalities for $\sigma_k$ function (Lecture given by Xinan Ma)The elementary symmetric functions appear naturally in the geometric quanti 阅读全文
摘要：
Book: A. Figalli 《The Monge Ampere Equation and Its Application》 1.Let $A,B\in R^{n\times n}$, and assume that $A$ is invertible. Then, $$\frac{d}{dt} 阅读全文