mh_theorems.sty

  %% mh_theorems -- theorem definitions by Michael Helmling.
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{mh_theorems}

\RequirePackage[amsmath,thmmarks]{ntheorem}
\def\theoremCountBasis{None}
\DeclareOption{chapter}{
 \def\theoremCountBasis{chapter}
}
\DeclareOption{section}{
 \def\theoremCountBasis{section}
}
\ProcessOptions
\relax
%Theorem-Umgebungen
%\swapnumbers
%\theoremheaderfont{\normalfont\bfseries\scshape}
\qedsymbol{\ensuremath{_\Box}}


 %Aussagen in Kursiv
\theorembodyfont{\itshape}
\theoremseparator{:}
\ifthenelse{\equal{\theoremCountBasis}{None}}
	{\theoremstyle{plain} % erst name dann zahl
	\newtheorem{theorem}{Theorem}
	}
	{\theoremstyle{change} %erst Zahl dann Name
	\newtheorem{theorem}{Theorem}[\theoremCountBasis]}
\newtheorem{proposition}[theorem]{Proposition}
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{corollary}[theorem]{Corollary}
\newtheorem{algo}[theorem]{Algorithm}
\newtheorem{observation}[theorem]{Observation}

% Anderes in normaler Schrift, dafür mit Dreieck am Ende
\theorembodyfont{\normalfont}
\theoremsymbol{\ensuremath{_\lhd}} %ein Dreieck am Ende von Beispielen ist cool
\newtheorem{definition}[theorem]{Definition}
\newtheorem{example}[theorem]{Example}
\newtheorem{problem}[theorem]{Problem}
\newtheorem{remark}[theorem]{Remark}

\theoremstyle{nonumberplain}
\theoremseparator{.}
\theoremheaderfont{\normalfont\bfseries\itshape}
\theoremsymbol{\ensuremath{_\Box}}
\newtheorem{proof}{Proof}
\theoremseparator{}
\theoremindent0cm
\newtheorem{fakeproof}{}