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<b>let </b><font color="Maroon">F</font> be    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">A</font>,<font color="Maroon">B</font>;<br/>

<a NAME="E1:33_1_1"/>
 ex <font color="Olive">t</font> being   <a href="nattra_1.html#M1" target="_self">transformation</a> of <font color="Maroon">F</font>,<font color="Maroon">F</font> st <br/>for <font color="Olive">a</font>, <font color="Olive">b</font> being  <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">A</font>  st  <a href="cat_1.html#K6">Hom</a> <font color="Olive">a</font>,<font color="Olive">b</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a>  holds <br/>for <font color="Olive">f</font> being   <a href="cat_1.html#M1">Morphism</a> of <font color="Olive">a</font>,<font color="Olive">b</font> holds  <span class="p1">(<span class="default"><font color="Olive">t</font> <a href="nattra_1.html#K5" target="_self">.</a> <font color="Olive">b</font></span>)</span> <a href="cat_1.html#K9">*</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="nattra_1.html#K3" target="_self">.</a> <font color="Olive">f</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="nattra_1.html#K3" target="_self">.</a> <font color="Olive">f</font></span>)</span> <a href="cat_1.html#K9">*</a> <span class="p1">(<span class="default"><font color="Olive">t</font> <a href="nattra_1.html#K5" target="_self">.</a> <font color="Olive">a</font></span>)</span>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="33_1_1_1"><b>proof </b></a><div class="add">

<b>take </b>
 <a href="nattra_1.html#K4" target="_self">id</a> <font color="Maroon">F</font>
;<br/>

<b>thus </b><a NAME="E1:33_1_1_1"/>
for <font color="Olive">a</font>, <font color="Olive">b</font> being  <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">A</font>  st  <a href="cat_1.html#K6">Hom</a> <font color="Olive">a</font>,<font color="Olive">b</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a>  holds <br/>for <font color="Olive">f</font> being   <a href="cat_1.html#M1">Morphism</a> of <font color="Olive">a</font>,<font color="Olive">b</font> holds  <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="nattra_1.html#K4" target="_self">id</a> <font color="Maroon">F</font></span>)</span> <a href="nattra_1.html#K5" target="_self">.</a> <font color="Olive">b</font></span>)</span> <a href="cat_1.html#K9">*</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="nattra_1.html#K3" target="_self">.</a> <font color="Olive">f</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="nattra_1.html#K3" target="_self">.</a> <font color="Olive">f</font></span>)</span> <a href="cat_1.html#K9">*</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="nattra_1.html#K4" target="_self">id</a> <font color="Maroon">F</font></span>)</span> <a href="nattra_1.html#K5" target="_self">.</a> <font color="Olive">a</font></span>)</span>
 <b>by </b><i/>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E2:33_1_1"/>
( <font color="Maroon">F</font> <a href="nattra_1.html#R1" target="_self">is_transformable_to</a> <font color="Maroon">F</font> &amp;  ex <font color="Olive">t</font> being   <a href="nattra_1.html#M1" target="_self">transformation</a> of <font color="Maroon">F</font>,<font color="Maroon">F</font> st <br/>for <font color="Olive">a</font>, <font color="Olive">b</font> being  <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">A</font>  st  <a href="cat_1.html#K6">Hom</a> <font color="Olive">a</font>,<font color="Olive">b</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a>  holds <br/>for <font color="Olive">f</font> being   <a href="cat_1.html#M1">Morphism</a> of <font color="Olive">a</font>,<font color="Olive">b</font> holds  <span class="p1">(<span class="default"><font color="Olive">t</font> <a href="nattra_1.html#K5" target="_self">.</a> <font color="Olive">b</font></span>)</span> <a href="cat_1.html#K9">*</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="nattra_1.html#K3" target="_self">.</a> <font color="Olive">f</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="nattra_1.html#K3" target="_self">.</a> <font color="Olive">f</font></span>)</span> <a href="cat_1.html#K9">*</a> <span class="p1">(<span class="default"><font color="Olive">t</font> <a href="nattra_1.html#K5" target="_self">.</a> <font color="Olive">a</font></span>)</span> )
 ;<br/>


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