New answers tagged parskip
Your code results in essentially two \parskips before and after the definition. Before the theorem you can set the spacing to \parskip by using \setlength rather than \addtolength in the adjustment of \thm@preskip. For after the theorem the relevant quantity is \thm@postskip, but this needs to be put to zero, as there comes a \parskip anyway: ...
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