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<span class="p1"><a href="pralg_2.html#K8" title="PRALG_2:func.8">[:</a><span class="default"><font color="Maroon" title="c2">A</font>,<font color="Maroon" title="c3">B</font></span><a href="pralg_2.html#K8" title="PRALG_2:func.8">:]</a></span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="msualg_1.html#G3" title="MSUALG_1:aggr.3">MSAlgebra</a>(# <span class="p1"><a href="pboole.html#K8" title="PBOOLE:func.8">[|</a><span class="default">the <a href="msualg_1.html#U3" title="MSUALG_1:sel.3">Sorts</a> of <font color="Maroon" title="c2">A</font>,the <a href="msualg_1.html#U3" title="MSUALG_1:sel.3">Sorts</a> of <font color="Maroon" title="c3">B</font></span><a href="pboole.html#K8" title="PBOOLE:func.8">|]</a></span>,<span class="p1"><a href="pralg_2.html#K4" title="PRALG_2:func.4">[[:</a><span class="default">the <a href="msualg_1.html#U4" title="MSUALG_1:sel.4">Charact</a> of <font color="Maroon" title="c2">A</font>,the <a href="msualg_1.html#U4" title="MSUALG_1:sel.4">Charact</a> of <font color="Maroon" title="c3">B</font></span><a href="pralg_2.html#K4" title="PRALG_2:func.4">:]]</a></span> #)
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="pralg_2.html#D15" title="PRALG_2:def.15">PRALG_2:def 15</a></span>;<br/>
<span class="kw">hence </span><a NAME="E2:7_1_1"/>
the <a href="msualg_1.html#U3" title="MSUALG_1:sel.3">Sorts</a> of <span class="p1"><a href="pralg_2.html#K8" title="PRALG_2:func.8">[:</a><span class="default"><font color="Maroon" title="c2">A</font>,<font color="Maroon" title="c3">B</font></span><a href="pralg_2.html#K8" title="PRALG_2:func.8">:]</a></span> is  <a href="relat_1.html#V2" title="RELAT_1:attr.2">non-empty</a> 
 ; <span class="comment"><font color="Red">:: according to </font></span><a class="ref" href="msualg_1.html#D8" title="MSUALG_1:def.8">MSUALG_1:def 8</a> <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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