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<span class="kw">let </span><font color="Maroon" title="c1">E</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> ( <font color="Maroon" title="c1">E</font> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  implies <font color="Maroon" title="c1">E</font> is  <a href="ordinal1.html#V5" title="ORDINAL1:attr.5">T-Sequence-like</a>  )</span><br/>

<span class="kw">assume </span><a NAME="E1:47_1_1"/>
<font color="Maroon" title="c1">E</font> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> 
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> <font color="Maroon" title="c1">E</font> is  <a href="ordinal1.html#V5" title="ORDINAL1:attr.5">T-Sequence-like</a> </span><br/>

<a NAME="E2:47_1_1"/><span class="kw">then </span>
 <a href="relat_1.html#K1" title="RELAT_1:func.1">proj1</a> <font color="Maroon" title="c1">E</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
 
;<br/>
<span class="kw">hence </span><a NAME="E3:47_1_1"/>
<font color="Maroon" title="c1">E</font> is  <a href="ordinal1.html#V5" title="ORDINAL1:attr.5">T-Sequence-like</a> 
 <span class="kw">by</span> <span class="lab"><a class="ref" href="ordinal1.html#D7" target="_self" title="ORDINAL1:def.7">Def7</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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