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I am having trouble nesting custom theorem environments in such a way that the inner environment does not inherit the characteristics (e.g. HEADFONT, etc.) of the outer environment.

Possibly the reason is that I hacked a numbered paragraph environment where the numbering is in parentheses. The parentheses seem to persist in the inner environment.





  {\topsep}   % ABOVESPACE
  {\topsep}   % BELOWSPACE
  {}    % BODYFONT
  {}       % INDENT (empty value is the same as 0pt)
  {\bfseries(} % HEADFONT
  {)}         % HEADPUNCT
  {}          % CUSTOM-HEAD-SPEC


    A definition outside the numbered paragraph.

    This is a numbered paragraph
        A definition inside a paragraph has leading open parentheses

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Why exactly do you want to nest theorems? If the offending opening parenthesis was gone, what would notify a reader that theorem 1.3 is an "inner" environment? – lockstep Jan 3 '12 at 22:40
Theorem environments are not supposed to nested, at least with amsthm; you can try ntheorem. – egreg Jan 3 '12 at 22:53
I would strongly encourage you to define pp in another way (doing it by hand is not difficult, and you can ask here on TeX.SE if you have problems;).) Basically, you shouldn't need much more than \newcounter, \arabic and \refstepcounter. – mbork Jan 4 '12 at 1:09
up vote 3 down vote accepted

You'll just have to re-define the theorem styles yourself. amsthm.sty bypasses its own user interface for the three pre-defined styles plain, definition and remark, so it won't explicitly clear many of the variables.

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