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<b>let </b><font color="Maroon">S</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="struct_0.html#L1">1-sorted</a> , <font color="Maroon">T</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="struct_0.html#L1">1-sorted</a> ;<br/><b>let </b><font color="Maroon">s</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">S</font>;<br/><b>let </b><font color="Maroon">t</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">T</font>;<br/>





<b>thus </b><span class="p1">(<span class="default"><font color="Maroon">S</font> <a href="borsuk_1.html#K3">--&gt;</a> <font color="Maroon">t</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">s</font> = 
<span class="p1">(<span class="default">the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">S</font> <a href="borsuk_1.html#K1">--&gt;</a> <font color="Maroon">t</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">s</font>
<b>by </b><i><a class="ref" href="borsuk_1.html#D2">BORSUK_1:def 2</a></i>
<br/>.= 
<font color="Maroon">t</font>
<b>by </b><i><a class="ref" href="funcop_1.html#T13">FUNCOP_1:13</a></i>
;<br/>


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