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<b>let </b><font color="Maroon">X</font> be  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#NM1">TopSpace</a>, <font color="Maroon">Y</font> be  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#NM1">TopSpace</a>;<br/><b>let </b><font color="Maroon">f</font> be   <a href="struct_0.html#NM6">Function</a> of <font color="Maroon">X</font>,<font color="Maroon">Y</font>;<br/>



<b>assume </b><a NAME="E1:50"/><i><font color="Green">E38</font></i>: 
 <a href="waybel18.html#K8">corestr</a> <font color="Maroon">f</font> is <a href="pre_topc.html#V5">continuous</a>
 ;<br/>

<a NAME="E2:50"/>
 <a href="waybel18.html#K8">corestr</a> <font color="Maroon">f</font> <a href="funct_2.html#R1">=</a> <font color="Maroon">f</font>
 
<b>by </b><i><a class="ref" href="waybel18.html#D7">WAYBEL18:def 7</a></i>;<br/>
<b>hence </b><a NAME="E3:50"/>
<font color="Maroon">f</font> is <a href="pre_topc.html#V5">continuous</a>
 <b>by </b><i>, <a class="ref" href="topmetr.html#T7">TOPMETR:7</a></i>;<br/>


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