class="doc_par">Error in command '<code class="doc_mono">\newtheorem</code>'. The definition of custom environment '<code class="doc_mono">theorem</code>' duplicates a previously defined environment.</p></div></li><li class="doc_error"><h1 class="doc_error_head">Error in line 7:</h1><ul class="doc_error_lines"><li class="doc_error_around"><span class="doc_error_linenum">006</span><span class="doc_error_linestr"></span></li><li class="doc_error_actual"><span class="doc_error_linenum">007</span><span class="d