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<b>let </b><font color="Maroon" title="c1">X</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">a1</font>, <font color="Maroon" title="c3">b1</font>, <font color="Maroon" title="c4">c1</font> be   <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c1">X</font>;<br/><b>let </b><font color="Maroon" title="c5">P1</font>, <font color="Maroon" title="c6">P2</font> be    <a href="borsuk_2.html#M1" title="BORSUK_2:mode.1">Path</a> of <font color="Maroon" title="c2">a1</font>,<font color="Maroon" title="c3">b1</font>;<br/><b>let </b><font color="Maroon" title="c7">Q1</font>, <font color="Maroon" title="c8">Q2</font> be    <a href="borsuk_2.html#M1" title="BORSUK_2:mode.1">Path</a> of <font color="Maroon" title="c3">b1</font>,<font color="Maroon" title="c4">c1</font>;<br/>











<a NAME="E1:102"/>
( <font color="Maroon" title="c2">a1</font>,<font color="Maroon" title="c3">b1</font> <a href="borsuk_6.html#R1" title="BORSUK_6:pred.1">are_connected</a>  &amp; <font color="Maroon" title="c3">b1</font>,<font color="Maroon" title="c4">c1</font> <a href="borsuk_6.html#R1" title="BORSUK_6:pred.1">are_connected</a>  )
 
<b>by </b><i><a class="ref" href="borsuk_2.html#D3" title="BORSUK_2:def.3">BORSUK_2:def 3</a></i>;<br/>
<b>hence </b><a NAME="E2:102"/>
( <font color="Maroon" title="c5">P1</font>,<font color="Maroon" title="c6">P2</font> <a href="borsuk_2.html#R4" title="BORSUK_2:pred.4">are_homotopic</a>  &amp; <font color="Maroon" title="c7">Q1</font>,<font color="Maroon" title="c8">Q2</font> <a href="borsuk_2.html#R4" title="BORSUK_2:pred.4">are_homotopic</a>  implies <font color="Maroon" title="c5">P1</font> <a href="borsuk_2.html#K1" title="BORSUK_2:func.1">+</a> <font color="Maroon" title="c7">Q1</font>,<font color="Maroon" title="c6">P2</font> <a href="borsuk_2.html#K1" title="BORSUK_2:func.1">+</a> <font color="Maroon" title="c8">Q2</font> <a href="borsuk_2.html#R4" title="BORSUK_2:pred.4">are_homotopic</a>  )
 <b>by </b><i><a class="ref" href="borsuk_6.html#T83" target="_self" title="BORSUK_6:th.83">Th83</a></i>;<br/>


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