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<b>let </b><font color="Maroon">M</font> be   <a href="net_1.html#NM1">Pnet</a>;<br/>

<b>set </b><font color="Maroon">R</font> = the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font>;<br/>
<a NAME="E1:23"/><i><font color="Green">E12</font></i>: 
the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="tarski.html#R1">c=</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><a href="net_1.html#K1">Elements</a> <font color="Maroon">M</font></span>)</span>,<span class="p2">(<span class="default"><a href="net_1.html#K1">Elements</a> <font color="Maroon">M</font></span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span>
 
<b>by </b><i/>;<br/>
<a NAME="E2:23"/>
<span class="p1">(<span class="default">the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K7">|</a> the <a href="net_1.html#U1">Places</a> of <font color="Maroon">M</font></span>)</span> <a href="xboole_0.html#K2">\/</a> <span class="p1">(<span class="default">the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K7">|</a> the <a href="net_1.html#U2">Transitions</a> of <font color="Maroon">M</font></span>)</span> <a href="hidden.html#R1">=</a> the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font>
 
<b>by </b><i><a class="ref" href="ff_siec.html#D4" target="_self">Def4</a>, <a class="ref" href="sysrel.html#T25">SYSREL:25</a></i>;<br/>
<b>hence </b><a NAME="E3:23"/>
( <span class="p1">(<span class="default">the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K7">|</a> the <a href="net_1.html#U1">Places</a> of <font color="Maroon">M</font></span>)</span> <a href="xboole_0.html#K2">\/</a> <span class="p1">(<span class="default">the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K7">|</a> the <a href="net_1.html#U2">Transitions</a> of <font color="Maroon">M</font></span>)</span> <a href="hidden.html#R1">=</a> the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> &amp; <span class="p1">(<span class="default">the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K7">|</a> the <a href="net_1.html#U2">Transitions</a> of <font color="Maroon">M</font></span>)</span> <a href="xboole_0.html#K2">\/</a> <span class="p1">(<span class="default">the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K7">|</a> the <a href="net_1.html#U1">Places</a> of <font color="Maroon">M</font></span>)</span> <a href="hidden.html#R1">=</a> the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> &amp; <span class="p1">(<span class="default"><span class="p2">(<span class="default">the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K7">|</a> the <a href="net_1.html#U1">Places</a> of <font color="Maroon">M</font></span>)</span> <a href="relat_1.html#K4">~</a> </span>)</span> <a href="xboole_0.html#K2">\/</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default">the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K7">|</a> the <a href="net_1.html#U2">Transitions</a> of <font color="Maroon">M</font></span>)</span> <a href="relat_1.html#K4">~</a> </span>)</span> <a href="hidden.html#R1">=</a> the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K4">~</a>  &amp; <span class="p1">(<span class="default"><span class="p2">(<span class="default">the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K7">|</a> the <a href="net_1.html#U2">Transitions</a> of <font color="Maroon">M</font></span>)</span> <a href="relat_1.html#K4">~</a> </span>)</span> <a href="xboole_0.html#K2">\/</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default">the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K7">|</a> the <a href="net_1.html#U1">Places</a> of <font color="Maroon">M</font></span>)</span> <a href="relat_1.html#K4">~</a> </span>)</span> <a href="hidden.html#R1">=</a> the <a href="net_1.html#U3">Flow</a> of <font color="Maroon">M</font> <a href="relat_1.html#K4">~</a>  )
 <b>by </b><i><a class="ref" href="relat_1.html#T40">RELAT_1:40</a></i>;<br/>


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