从动能到广义动量：经典力学中的对偶关系From Kinetic Energy to Generalized Momentum: Duality in Classical Mechanics
从动能的变分出发，推导广义动量，讨论坐标度量与 Legendre 对偶。
Archive
20264
September1
August2
代数几何中的 Chow 环成功涌现出相对论时空Chow Ring in Algebraic Geometry Successfully Gives Rise to Relativistic Spacetime
A local Lorentzian signature emerging from the intersection form of a Chow ring on a product of projective lines.
常微分方程Ordinary Differential Equations
From algebraic equations to the essence and geometric meaning of ordinary differential equations.
June1
矩阵乘法、张量、向量的共通本质The Common Structure of Matrix Multiplication, Tensors, and Vectors
矩阵乘法的本质是线性组合；矩阵乘法与张量积是同一个双线性结构的不同排布表现。