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<b>let </b><font color="Maroon">S</font> be  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#NM1">TopSpace</a>;<br/><b>let </b><font color="Maroon">T</font> be  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#NM1">TopSpace</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><a NAME="E1:44"/>
 <a href="relset_1.html#K5">rng</a> <span class="p1">(<span class="default"><a href="topalg_4.html#K13" target="_self">FGPrIso</a> <font color="Maroon">s</font>,<font color="Maroon">t</font></span>)</span> <a href="hidden.html#R1">=</a> the <a href="struct_0.html#U1">carrier</a> of <span class="p1">(<span class="default"><a href="group_7.html#K2">product</a> <span class="p2"><a href="group_7.html#K15">&lt;*</a><span class="default"><span class="p3">(<span class="default"><a href="topalg_1.html#NK4" target="_self">pi_1</a> <font color="Maroon">S</font>,<font color="Maroon">s</font></span>)</span>,<span class="p3">(<span class="default"><a href="topalg_1.html#NK4" target="_self">pi_1</a> <font color="Maroon">T</font>,<font color="Maroon">t</font></span>)</span></span><a href="group_7.html#K15">*&gt;</a></span></span>)</span>
 <b>by </b><i><a class="ref" href="funct_2.html#D3">FUNCT_2:def 3</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="group_6.html#D13">GROUP_6:def 13</a>,<a class="ref" href="group_6.html#D14">GROUP_6:def 14</a><br/>

<b>thus </b><a NAME="E2:44"/>
 <a href="topalg_4.html#K13" target="_self">FGPrIso</a> <font color="Maroon">s</font>,<font color="Maroon">t</font> is <a href="funct_1.html#V2">one-to-one</a>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="group_6.html#D12">GROUP_6:def 12</a><br/>


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