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<b>let </b><font color="Maroon" title="c1">G1</font> be   <a href="glib_000.html#NM2" title="GLIB_000:NM.2">_Graph</a>;<br/><b>let </b><font color="Maroon" title="c2">G2</font> be    <a href="glib_000.html#M2" title="GLIB_000:mode.2">Subgraph</a> of <font color="Maroon" title="c1">G1</font>;<br/><b>let </b><font color="Maroon" title="c3">X</font>, <font color="Maroon" title="c4">Y</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>





<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="170_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon" title="c5">x</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/><b>assume </b><a NAME="E1:170_1"/>
<font color="Maroon" title="c5">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c2">G2</font> <a href="glib_000.html#K23" title="GLIB_000:func.23">.edgesBetween</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font>
 ;<br/><a NAME="E2:170_1"/><b>then </b>
<font color="Maroon" title="c5">x</font> <a href="glib_000.html#R3" title="GLIB_000:pred.3">SJoins</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font>,<font color="Maroon" title="c2">G2</font>
 <b>by </b><i><a class="ref" href="glib_000.html#D32" target="_self" title="GLIB_000:def.32">Def32</a></i>;<br/><a NAME="E3:170_1"/><b>then </b>
<font color="Maroon" title="c5">x</font> <a href="glib_000.html#R3" title="GLIB_000:pred.3">SJoins</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font>,<font color="Maroon" title="c1">G1</font>
 <b>by </b><i><a class="ref" href="glib_000.html#T75" target="_self" title="GLIB_000:th.75">Th75</a></i>;<br/><b>hence </b><a NAME="E4:170_1"/>
<font color="Maroon" title="c5">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c1">G1</font> <a href="glib_000.html#K23" title="GLIB_000:func.23">.edgesBetween</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font>
 <b>by </b><i><a class="ref" href="glib_000.html#D32" target="_self" title="GLIB_000:def.32">Def32</a></i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E2:170"/>
<font color="Maroon" title="c2">G2</font> <a href="glib_000.html#K23" title="GLIB_000:func.23">.edgesBetween</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c1">G1</font> <a href="glib_000.html#K23" title="GLIB_000:func.23">.edgesBetween</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font>
 <b>by </b><i><a class="ref" href="tarski.html#D3" title="TARSKI:def.3">TARSKI:def 3</a></i>;<br/>

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="170_2"><b>now </b></a><div class="add"><b>let </b><font color="Maroon" title="c5">x</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/><b>assume </b><a NAME="E1:170_2"/>
<font color="Maroon" title="c5">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c2">G2</font> <a href="glib_000.html#K24" title="GLIB_000:func.24">.edgesDBetween</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font>
 ;<br/><a NAME="E2:170_2"/><b>then </b>
<font color="Maroon" title="c5">x</font> <a href="glib_000.html#R4" title="GLIB_000:pred.4">DSJoins</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font>,<font color="Maroon" title="c2">G2</font>
 <b>by </b><i><a class="ref" href="glib_000.html#D33" target="_self" title="GLIB_000:def.33">Def33</a></i>;<br/><a NAME="E3:170_2"/><b>then </b>
<font color="Maroon" title="c5">x</font> <a href="glib_000.html#R4" title="GLIB_000:pred.4">DSJoins</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font>,<font color="Maroon" title="c1">G1</font>
 <b>by </b><i><a class="ref" href="glib_000.html#T75" target="_self" title="GLIB_000:th.75">Th75</a></i>;<br/><b>hence </b><a NAME="E4:170_2"/>
<font color="Maroon" title="c5">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c1">G1</font> <a href="glib_000.html#K24" title="GLIB_000:func.24">.edgesDBetween</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font>
 <b>by </b><i><a class="ref" href="glib_000.html#D33" target="_self" title="GLIB_000:def.33">Def33</a></i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E4:170"/>
<font color="Maroon" title="c2">G2</font> <a href="glib_000.html#K24" title="GLIB_000:func.24">.edgesDBetween</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c1">G1</font> <a href="glib_000.html#K24" title="GLIB_000:func.24">.edgesDBetween</a> <font color="Maroon" title="c3">X</font>,<font color="Maroon" title="c4">Y</font>
 <b>by </b><i><a class="ref" href="tarski.html#D3" title="TARSKI:def.3">TARSKI:def 3</a></i>;<br/>


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