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<b>let </b><font color="Maroon">T</font> be  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#NM1">TopSpace</a>;<br/>

<b>assume </b><a NAME="E1:35"/><i><font color="Green">E19</font></i>: 
for <font color="Olive">A</font> being  <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font>  st ( for <font color="Olive">S</font> being  <a href="normsp_1.html#NM2">sequence</a> of <font color="Maroon">T</font>  st <font color="Olive">S</font> is <a href="frechet.html#V2" target="_self">convergent</a> &amp;  <a href="relset_1.html#K5">rng</a> <font color="Olive">S</font> <a href="tarski.html#R1">c=</a> <font color="Olive">A</font> holds <br/> <a href="frechet.html#K1" target="_self">Lim</a> <font color="Olive">S</font> <a href="tarski.html#R1">c=</a> <font color="Olive">A</font> ) holds <br/><font color="Olive">A</font> is <a href="pre_topc.html#V4">closed</a>
 ;<br/>

<b>let </b><font color="Maroon">A</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="frechet.html#D6" target="_self">FRECHET:def 6</a><br/>

<b>thus </b><a NAME="E2:35"/>
( <font color="Maroon">A</font> is <a href="pre_topc.html#V4">closed</a> implies for <font color="Olive">S</font> being  <a href="normsp_1.html#NM2">sequence</a> of <font color="Maroon">T</font>  st <font color="Olive">S</font> is <a href="frechet.html#V2" target="_self">convergent</a> &amp;  <a href="relset_1.html#K5">rng</a> <font color="Olive">S</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">A</font> holds <br/> <a href="frechet.html#K1" target="_self">Lim</a> <font color="Olive">S</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">A</font> )
 <b>by </b><i/>;<br/>

<b>assume </b><a NAME="E3:35"/>
for <font color="Olive">S</font> being  <a href="normsp_1.html#NM2">sequence</a> of <font color="Maroon">T</font>  st <font color="Olive">S</font> is <a href="frechet.html#V2" target="_self">convergent</a> &amp;  <a href="relset_1.html#K5">rng</a> <font color="Olive">S</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">A</font> holds <br/> <a href="frechet.html#K1" target="_self">Lim</a> <font color="Olive">S</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">A</font>
 ;<br/>

<b>hence </b><a NAME="E4:35"/>
<font color="Maroon">A</font> is <a href="pre_topc.html#V4">closed</a>
 <b>by </b><i/>;<br/>


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