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<div><span class="kw">theorem </span><a NAME="T10"><span class="comment"><font color="firebrick">:: PETRI:10</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">PTN</font> being   <a href="petri.html#NM2" title="PETRI:NM.2">Petri_net</a> holds  <span class="p1">(<span class="default"><a href="subset_1.html#K1" title="SUBSET_1:func.1">{}</a>  the <a href="struct_0.html#U1" title="STRUCT_0:sel.1">carrier</a> of <font color="Olive" title="b1">PTN</font></span>)</span> <a href="petri.html#K7" title="PETRI:func.7">*'</a>  <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> </div></div>
