Sorry for the messy title, but let me explain. I have a long code doing a bunch of manipulations on an expressions including (among others) a function f=sp.Function('f')(x,y). My end result is some huge expression, but I noted that there are terms that look likeSorry for the messy title, but let me explain.
阅读背景：
Sympy认为同一个变量是两个不同的变量
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