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Portable, Extensible Toolkit Scientific Computations.

Wiki 上看到了这样一个命题:

If $$p$$ is prime and $$G$$ is a group of order $$p^k$$, then $$G$$ has a normal subgroup of order $$p^m$$ for every $$1\leqslant m \leqslant k$$.

enumitem 的宏包手册 中有 5 个长度命令 \leftmargin, \itemindent, \labelindent, \labelwidth\labelsep. 这些长度关系以及互相的制约让人头疼, 而 enumitem 的作者也晓得这一点:

New 3.6 If you find these parameters baffling, you are not alone. You can visualize them by writing \DrawEnumitemLabel just before the first item (or in first), which draws 4 rules from top to bottom, labelindent, labelwidth, labelsep, itemindent (thin if positive, thick if negative); the leftmargin is marked with two vertical rules.

ssayno 的博客 没备份挂了之后, 来写一个我备份博客的方法.