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<font color="Maroon">x0</font>,<font color="Maroon">x1</font> <a href="borsuk_6.html#R1">are_connected</a> 
 
<b>by </b><i><a class="ref" href="borsuk_2.html#D3">BORSUK_2:def 3</a></i>;<br/>
<b>hence </b><a NAME="E2:67_1_1"/>
(  <a href="topalg_1.html#K5" target="_self">pi_1-iso</a> <font color="Maroon">P</font> is <a href="funct_1.html#V2">one-to-one</a> &amp;  <a href="topalg_1.html#K5" target="_self">pi_1-iso</a> <font color="Maroon">P</font> is <a href="funct_2.html#V2">onto</a> )
 <b>by </b><i>, <a class="ref" href="topalg_1.html#T2" target="_self">Th2</a></i>;<br/>


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