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<b>let </b><font color="Maroon">X</font> be  non <a href="struct_0.html#V3">empty</a> <a href="tdlat_3.html#V3">almost_discrete</a> <a href="pre_topc.html#NM1">TopSpace</a>;<br/><b>let </b><font color="Maroon">X0</font> be  non <a href="struct_0.html#V3">empty</a> <a href="tdlat_3.html#V1">discrete</a>  <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">X</font>;<br/>



<b>consider </b><font color="Maroon">r</font> being  <a href="pre_topc.html#V5">continuous</a> <a href="struct_0.html#NM6">Function</a> of <font color="Maroon">X</font>,<font color="Maroon">X0</font><b> such that </b><br/><a NAME="E2:129"/><i><font color="Green">E17</font></i>: 
<font color="Maroon">r</font> <a href="borsuk_1.html#NR1" target="_self">is_a_retraction</a> 
 <b>by </b><i/>;<br/>
<b>thus </b><a NAME="E3:129"/>
<font color="Maroon">X0</font> <a href="borsuk_1.html#R1">is_a_retract_of</a> <font color="Maroon">X</font>
 <b>by </b><i><a class="ref" href="tex_2.html#T23" target="_self">Th23</a>, <a class="ref" href="borsuk_1.html#D20">BORSUK_1:def 20</a></i>;<br/>


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