$$ \operatorname{Tr}(A+B) \equiv \operatorname{Tr}(A)+\operatorname{Tr}(B) $$$$ \operatorname{Tr}(A B \ldots Y Z) \equiv \operatorname{Tr}(Z A B \ldots Y) $$$$ \gamma^{\mu} \gamma^{\nu}+\gamma^{\nu} \gamma^{\mu} \equiv 2 g^{\mu \nu} I $$...
Quantum Feild Theory Ryder Chapter 2 Single-particle relativistic wave equations...
Date start 2022-01-20 Le Petit Prince Chapter I ...
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Android is based on linux kernel, so in theory Android system is able to accomplish many tasks in Linux. ...
内网穿透 最简单的方案为ssh端口转发，但是ssh断掉之后不会自动重连，我们需要autossh，它可以监控本地端口状态自动重连 ...
Group Theory for Physicists 2.2 Group and its Multiplication Table Symmetric Transformation: A transformation is called the symmetric transformation of a system if it preserves the system invariant. Definition of a Group: A group $G$ is a set of symmetric transformation with a defined multiplication of elements, and satisfies the following rules: ...
A visual introduction to differential forms and calculus on manifolds Chapter 1 Background material 1.1 Review of vector spaces vector spaces $u,v,w\in V$,$c,d \in \mathbb R$ $v+w=w+v$ $(u+v)+w=u+(v+w)$ $v+0=0+v$ $v+(-v)=0$ $1\cdot v=v$ $c\cdot (d\cdot v)=(c\cdot d)\cdot v$ $c\cdot(v+w)=c\cdot v+c\cdot w$ $(c+d)\cdot v=c\cdot v+d\cdot v$ ...
前天把阿里云服务器的Ubuntu重装成了ArchLinux ...