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<b>let </b><font color="Maroon" title="c1">T</font> be  non <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a> <a href="borsuk_2.html#V1" title="BORSUK_2:attr.1">arcwise_connected</a> <a href="pre_topc.html#NM1" title="PRE_TOPC:NM.1">TopSpace</a>;<br/><b>let </b><font color="Maroon" title="c2">y0</font>, <font color="Maroon" title="c3">y1</font> be   <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c1">T</font>;<br/>





<b>consider </b><font color="Maroon" title="c4">R</font> being    <a href="borsuk_2.html#M1" title="BORSUK_2:mode.1">Path</a> of <font color="Maroon" title="c3">y1</font>,<font color="Maroon" title="c2">y0</font>;<br/>
<b>take </b>
 <a href="topalg_1.html#K5" title="TOPALG_1:func.5">pi_1-iso</a> <font color="Maroon" title="c4">R</font>
; <i><font color="Red">:: according to </font></i><a class="ref" href="group_6.html#D15" title="GROUP_6:def.15">GROUP_6:def 15</a><br/>

<b>thus </b><a NAME="E2:73"/>
 <a href="topalg_1.html#K5" title="TOPALG_1:func.5">pi_1-iso</a> <font color="Maroon" title="c4">R</font> <a href="group_6.html#NR3" title="GROUP_6:NR.3">is_isomorphism</a> 
 <b>by </b><i><a class="ref" href="topalg_1.html#T57" target="_self" title="TOPALG_1:th.57">Th57</a></i>;<br/>


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