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I want to redefine the Theorem environment so that there is a vertical line on the left side of the content of \begin{theorem} \end{theorem}, except for the first line. I have no idea how to do it or if I need a new package besides AMS's.

Pedro G. Mattos
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    See e.g. https://tex.stackexchange.com/q/101507/82917 – campa Apr 09 '21 at 15:18
  • You should be able to do it with mdframed, but I don't understand precisely what you mean by "except for the first line". Can you mock up a desired output? Also, are you already using some theorem packages, like amsthm or ntheorem? It would be helpful to make your constraints clear. – Willie Wong Apr 09 '21 at 16:27
  • @campa 's comment basically answers my question, but I would prefer that the text started right after Proof, not in the next line. That is what I mean by "except for tyhe first line". The word Proof (or Theorem etc) on the first line, and from the second line onwards a left-side rule just as in tex.stackexchange.com/q/101507/8291 – Pedro G. Mattos Apr 09 '21 at 16:49
  • I use the package amsthm – Pedro G. Mattos Apr 09 '21 at 16:51

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