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<b>let </b><font color="Maroon" title="c6">t</font>, <font color="Maroon" title="c7">t'</font> be    <a href="nattra_1.html#M1" title="NATTRA_1:mode.1">transformation</a> of <font color="Maroon" title="c4">F2</font>,<font color="Maroon" title="c3">F1</font>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:45_1_2"/><i><font color="Green" title="E39">A5</font></i>: 
for <font color="Olive" title="b1">a</font> being  <a href="cat_1.html#NM1" title="CAT_1:NM.1">Object</a> of <font color="Maroon" title="c1">A</font> holds  <font color="Maroon" title="c6">t</font> <a href="nattra_1.html#K5" title="NATTRA_1:func.5">.</a> <font color="Olive" title="b1">a</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><font color="Maroon" title="c5">t1</font> <a href="nattra_1.html#K5" title="NATTRA_1:func.5">.</a> <font color="Olive" title="b1">a</font></span>)</span> <a href="cat_1.html#K11" title="CAT_1:func.11">"</a> 
 <b>and </b><br/><a NAME="E2:45_1_2"/><i><font color="Green" title="E40">A6</font></i>: 
for <font color="Olive" title="b1">a</font> being  <a href="cat_1.html#NM1" title="CAT_1:NM.1">Object</a> of <font color="Maroon" title="c1">A</font> holds  <font color="Maroon" title="c7">t'</font> <a href="nattra_1.html#K5" title="NATTRA_1:func.5">.</a> <font color="Olive" title="b1">a</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><font color="Maroon" title="c5">t1</font> <a href="nattra_1.html#K5" title="NATTRA_1:func.5">.</a> <font color="Olive" title="b1">a</font></span>)</span> <a href="cat_1.html#K11" title="CAT_1:func.11">"</a> 
 ;<br/>

<a NAME="E3:45_1_2"/><i><font color="Green" title="E41">A7</font></i>: 
<font color="Maroon" title="c4">F2</font> <a href="nattra_1.html#R1" title="NATTRA_1:pred.1">is_transformable_to</a> <font color="Maroon" title="c3">F1</font>
 
<b>by </b><i><a class="txt" href="nattra_1.html#E1:45"><i><font color="Green" title="E37">A1</font></i></a>, <a class="txt" href="nattra_1.html#E2:45"><i><font color="Green" title="E38">A2</font></i></a>, <a class="txt" href="nattra_1.html#E42"><i><font color="Green" title="E36">Lm3</font></i></a></i>;<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="45_1_2_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon" title="c8">a</font> be   <a href="cat_1.html#NM1" title="CAT_1:NM.1">Object</a> of <font color="Maroon" title="c1">A</font>;<br/><b>thus </b><font color="Maroon" title="c6">t</font> <a href="nattra_1.html#K5" title="NATTRA_1:func.5">.</a> <font color="Maroon" title="c8">a</font> = 
<span class="p1">(<span class="default"><font color="Maroon" title="c5">t1</font> <a href="nattra_1.html#K5" title="NATTRA_1:func.5">.</a> <font color="Maroon" title="c8">a</font></span>)</span> <a href="cat_1.html#K11" title="CAT_1:func.11">"</a> 
<b>by </b><i><a class="txt" href="nattra_1.html#E1:45_1_2"><i><font color="Green" title="E39">A5</font></i></a></i>
<br/>.= 
<font color="Maroon" title="c7">t'</font> <a href="nattra_1.html#K5" title="NATTRA_1:func.5">.</a> <font color="Maroon" title="c8">a</font>
<b>by </b><i><a class="txt" href="nattra_1.html#E2:45_1_2"><i><font color="Green" title="E40">A6</font></i></a></i>
;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E5:45_1_2"/>
<font color="Maroon" title="c6">t</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c7">t'</font>
 <b>by </b><i><a class="txt" href="nattra_1.html#E3:45_1_2"><i><font color="Green" title="E41">A7</font></i></a>, <a class="ref" href="nattra_1.html#T20" target="_self" title="NATTRA_1:th.20">Th20</a></i>;<br/>


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