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<b>let </b><font color="Maroon" title="c1">T</font> be   <a href="subset_1.html#NM2" title="SUBSET_1:NM.2">Subset</a> of <a href="intpro_1.html#K1" title="INTPRO_1:func.1">MC-wff</a> ;<br/>

<b>assume </b><a NAME="E1:145"/><i><font color="Green" title="E108">A1</font></i>: 
<font color="Maroon" title="c1">T</font> is <a href="intpro_1.html#V10" title="INTPRO_1:attr.10">S4_theory</a>
 ;<br/>

<a NAME="E2:145"/>
 <a href="intpro_1.html#K14" title="INTPRO_1:func.14">S4-Taut</a>  <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="intpro_1.html#K13" title="INTPRO_1:func.13">CnS4</a> <font color="Maroon" title="c1">T</font>
 
<b>by </b><i><a class="ref" href="intpro_1.html#T90" target="_self" title="INTPRO_1:th.90">Th90</a>, <a class="ref" href="xboole_1.html#T2" title="XBOOLE_1:th.2">XBOOLE_1:2</a></i>;<br/>
<b>hence </b><a NAME="E3:145"/>
 <a href="intpro_1.html#K14" title="INTPRO_1:func.14">S4-Taut</a>  <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c1">T</font>
 <b>by </b><i><a class="txt" href="intpro_1.html#E1:145"><i><font color="Green" title="E108">A1</font></i></a>, <a class="ref" href="intpro_1.html#T92" target="_self" title="INTPRO_1:th.92">Th92</a></i>;<br/>


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