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<b>set </b><font color="Maroon" title="c1">D</font> = <span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><a href="algstr_1.html#K2" title="ALGSTR_1:func.2">L_Trivial</a> </span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span>;<br/>
<a NAME="E1:54_1_1"/><i><font color="Green" title="E34">A1</font></i>: 
for <font color="Olive" title="b1">x</font> being   <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a>   st <font color="Olive" title="b1">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><a href="algstr_1.html#K2" title="ALGSTR_1:func.2">L_Trivial</a> </span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span> holds <br/><font color="Olive" title="b1">x</font> is  <a href="rlvect_1.html#V1" title="RLVECT_1:attr.1">strict</a> <a href="mod_1.html#NM1" title="MOD_1:NM.1">AddGroup</a>
 
<b>by </b><i><a class="ref" href="tarski.html#D1" title="TARSKI:def.1">TARSKI:def 1</a></i>;<br/>
<b>take </b>
<span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><a href="algstr_1.html#K2" title="ALGSTR_1:func.2">L_Trivial</a> </span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span>
;<br/>

<b>thus </b><a NAME="E2:54_1_1"/>
( <span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><a href="algstr_1.html#K2" title="ALGSTR_1:func.2">L_Trivial</a> </span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span> is <a href="grcat_1.html#V4" title="GRCAT_1:attr.4">Group_DOMAIN-like</a> &amp; not <span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><a href="algstr_1.html#K2" title="ALGSTR_1:func.2">L_Trivial</a> </span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> )
 <b>by </b><i><a class="txt" href="grcat_1.html#E1:54_1_1"><i><font color="Green" title="E34">A1</font></i></a>, <a class="ref" href="grcat_1.html#D22" target="_self" title="GRCAT_1:def.22">Def22</a></i>;<br/>


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