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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 ...

摸鱼的一天，没怎么看论文，在折腾一些软件。 ...