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Desvl
desvl.xyz
2021
Several ways to prove Hardy's inequality
Tensor Product as a Universal Object (Category Theory & Module Theory)
Why Does a Vector Space Have a Basis (Module Theory)
Rings of Fractions and Localization
The Grothendienck Group
2020
Study Vector Bundle in a Relatively Harder Way - Tangent Bundle
A continuous functional sending L^p functions to L^1
Study Vector Bundle in a Relatively Harder Way - Definition
The Big Three Pt. 6 - Closed Graph Theorem with Applications
Partition of Unity on Different Manifolds (Part 1. Introduction)
Stirling 公式的几种经典估计
A proof of the ordinary Gleason-Kahane-Żelazko theorem for complex functionals
The Big Three Pt. 5 - The Hahn-Banach Theorem (Dominated Extension)
A long exact sequence of cohomology groups (zig-zag and diagram-chasing)
The Fourier transform of sinx/x and (sinx/x)^2 and more
The Riesz-Markov-Kakutani Representation Theorem
The Big Three Pt. 4 - The Open Mapping Theorem (F-Space)
The completeness of the quotient space (topological vector space)
Introducing Riemann-Stieltjes Integral
Basic Facts of Semicontinuous Functions
An Introduction to Quotient Space
关于《第三次忍受》
The Big Three Pt. 3 - The Open Mapping Theorem (Banach Space)
Cauchy sequence in group theory
A brief introduction to Fréchet derivative
An elementary introduction to profinite groups
线性 ODE(四)——常系数高阶线性微分方程的普遍解法
A continuous function is 'mostly' nowhere differentiable
The Big Three Pt. 2 - The Banach-Steinhaus Theorem
The Big Three Pt. 1 - Baire Category Theorem Explained
Jordan 标准形的求法——以一个四阶矩阵为例
矩阵 Jordan 标准形的原理
More properties of zeros of an entire function
Linear ODE but Quotient Spaces
Prove Picard's Existence and Uniqueness Theorem on Different Levels
线性 ODE(三)——初探高阶线性方程
关于《有人弄乱了这束玫瑰花》
线性 ODE(二)——用矩阵表示方程组
线性 ODE(一)——线性方程的思想与一阶方程
高等数学入门——理解无穷小的阶(微积分的“科学计数法”)
The Lebesgue-Radon-Nikodym theorem and how von Neumann proved it
Counterexamples of Fubini's theorem
Fubini's theorem in Euclidean space (Understanding 'almost everywhere')
Topological properties of the zeros of a holomorphic function
准素分解与准素标准型
线性空间的循环分解
线性变换不变子空间的导子及其性质
线性空间的循环子空间与简单应用
抽象 Lebesgue 积分的构建
2019
并不新颖的观点:不要追求生产力、效率了
高等数学入门:上下确界及其极限形式
调和级数发散的若干证明
洛必达法则的几种不同的证明
优美的 Fourier 级数(二): 有界差分下的收敛(Jordan 判别法)
优美的 Fourier 级数(一): 绝对不只是求表达式的问题
压缩定理和其应用