其实搜到了一个很好的回答,但是首先我不知道Rmd能不能定义命令,而且反正只用这么一次……丑陋的代码诞生了。
#不好笑的数字生活

amssymb - Is there no good way to write \not\iff? - TeX - LaTeX Stack Exchange
tex.stackexchange.com/question

@alteredEnvoy 也不知道Rmd能不能用包……。用了这么久都没查过是我懒 :blobsweats:

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