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<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="hidden.html#M1">set</a> ] <b>means </b> ex <font color="Olive">f</font> being  <a href="petri.html#NM6">S-T_arc</a> of <font color="Maroon">PTN</font> ex <font color="Olive">t</font> being  <a href="petri.html#NM4">transition</a> of <font color="Maroon">PTN</font> st <br/>( <font color="Olive">t</font> <a href="hidden.html#R2">in</a> <font color="Maroon">T0</font> &amp; <font color="Olive">f</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Maroon">a<sub>1</sub></font>,<font color="Olive">t</font></span><a href="tarski.html#K4">]</a></span> );<br/>
<a NAME="E1:11_1_1"/>
<span class="p1">{<span class="default"> <font color="Olive">s</font> where <font color="Olive">s</font> is   <a href="petri.html#NM2">place</a> of <font color="Maroon">PTN</font> : <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">s</font>] </span>}</span>  is   <a href="subset_1.html#NM2">Subset</a> of the <a href="petri.html#U1" target="_self">Places</a> of <font color="Maroon">PTN</font>
 
<b>from </b><i><a class="ref" href="domain_1.html#S7">DOMAIN_1:sch 7</a>();<br/></i>
<b>hence </b><a NAME="E2:11_1_1"/>
<span class="p1">{<span class="default"> <font color="Olive">s</font> where <font color="Olive">s</font> is   <a href="petri.html#NM2">place</a> of <font color="Maroon">PTN</font> :  ex <font color="Olive">f</font> being  <a href="petri.html#NM6">S-T_arc</a> of <font color="Maroon">PTN</font> ex <font color="Olive">t</font> being  <a href="petri.html#NM4">transition</a> of <font color="Maroon">PTN</font> st <br/>( <font color="Olive">t</font> <a href="hidden.html#R2">in</a> <font color="Maroon">T0</font> &amp; <font color="Olive">f</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">s</font>,<font color="Olive">t</font></span><a href="domain_1.html#K1">]</a></span> ) </span>}</span>  is   <a href="subset_1.html#NM2">Subset</a> of the <a href="petri.html#U1" target="_self">Places</a> of <font color="Maroon">PTN</font>
 ;<br/>


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