1 Answer

  1. Arthur- Reply


    There is no such problem using ntheorem instead of amsthm. Note ntheorem has a compatibilty mode with amsthm:

      \usepackage[thmmarks, amsmath, thref, amsthm]{ntheorem}
        \item $a²+b²=c²$
        \item $a²+b²=c²$

    enter image description here

    One might as well define a lemma environment, which by default has a qed-symbol at the end. This qed-symbol may be for deactivated for specific environments with the directive \NoEndMarks. Also, the symbol is easily customised on a per-theorem basis.

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