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<b>let </b><font color="Maroon" title="c1">F</font>, <font color="Maroon" title="c2">G</font> be  <a href="membered.html#V2" title="MEMBERED:attr.2">ext-real-membered</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide">  <a href="member_1.html#K1" title="MEMBER_1:func.1">--</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">F</font> <a href="xboole_0.html#K5" title="XBOOLE_0:func.5">\+\</a> <font color="Maroon" title="c2">G</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><a href="member_1.html#K1" title="MEMBER_1:func.1">--</a> <font color="Maroon" title="c1">F</font></span>)</span> <a href="xboole_0.html#K5" title="XBOOLE_0:func.5">\+\</a> <span class="p1">(<span class="default"><a href="member_1.html#K1" title="MEMBER_1:func.1">--</a> <font color="Maroon" title="c2">G</font></span>)</span></span><br/>



<b>thus </b> <a href="member_1.html#K1" title="MEMBER_1:func.1">--</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">F</font> <a href="xboole_0.html#K5" title="XBOOLE_0:func.5">\+\</a> <font color="Maroon" title="c2">G</font></span>)</span> = 
<span class="p1">(<span class="default"><a href="member_1.html#K1" title="MEMBER_1:func.1">--</a> <span class="p2">(<span class="default"><font color="Maroon" title="c1">F</font> <a href="subset_1.html#K6" title="SUBSET_1:func.6">\</a> <font color="Maroon" title="c2">G</font></span>)</span></span>)</span> <a href="xboole_0.html#K2" title="XBOOLE_0:func.2">\/</a> <span class="p1">(<span class="default"><a href="member_1.html#K1" title="MEMBER_1:func.1">--</a> <span class="p2">(<span class="default"><font color="Maroon" title="c2">G</font> <a href="subset_1.html#K6" title="SUBSET_1:func.6">\</a> <font color="Maroon" title="c1">F</font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="member_1.html#T11" target="_self" title="MEMBER_1:th.11">Th11</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="member_1.html#K1" title="MEMBER_1:func.1">--</a> <font color="Maroon" title="c1">F</font></span>)</span> <a href="subset_1.html#K6" title="SUBSET_1:func.6">\</a> <span class="p2">(<span class="default"><a href="member_1.html#K1" title="MEMBER_1:func.1">--</a> <font color="Maroon" title="c2">G</font></span>)</span></span>)</span> <a href="xboole_0.html#K2" title="XBOOLE_0:func.2">\/</a> <span class="p1">(<span class="default"><a href="member_1.html#K1" title="MEMBER_1:func.1">--</a> <span class="p2">(<span class="default"><font color="Maroon" title="c2">G</font> <a href="subset_1.html#K6" title="SUBSET_1:func.6">\</a> <font color="Maroon" title="c1">F</font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="member_1.html#T13" target="_self" title="MEMBER_1:th.13">Th13</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="member_1.html#K1" title="MEMBER_1:func.1">--</a> <font color="Maroon" title="c1">F</font></span>)</span> <a href="xboole_0.html#K5" title="XBOOLE_0:func.5">\+\</a> <span class="p1">(<span class="default"><a href="member_1.html#K1" title="MEMBER_1:func.1">--</a> <font color="Maroon" title="c2">G</font></span>)</span>
<b>by </b><i><a class="ref" href="member_1.html#T13" target="_self" title="MEMBER_1:th.13">Th13</a></i>
; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


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