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<b>let </b><font color="Maroon">A</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">B</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">C</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">F1</font> be    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">A</font>,<font color="Maroon">B</font>, <font color="Maroon">F2</font> be    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">A</font>,<font color="Maroon">B</font>;<br/><b>let </b><font color="Maroon">G</font> be    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">B</font>,<font color="Maroon">C</font>;<br/>









<b>assume </b><a NAME="E1:41"/><i><font color="Green">E16</font></i>: 
<font color="Maroon">F1</font> <a href="nattra_1.html#R2">is_naturally_transformable_to</a> <font color="Maroon">F2</font>
 ;<br/>

<a NAME="E2:41"/><b>then </b><i><font color="Green">E17</font></i>: 
<font color="Maroon">F1</font> <a href="nattra_1.html#R1">is_transformable_to</a> <font color="Maroon">F2</font>
 
<b>by </b><i><a class="ref" href="nattra_1.html#D7">NATTRA_1:def 7</a></i>;<br/>
<b>let </b><font color="Maroon">t</font> be    <a href="nattra_1.html#M2">natural_transformation</a> of <font color="Maroon">F1</font>,<font color="Maroon">F2</font>;<br/>

<b>thus </b><font color="Maroon">G</font> <a href="isocat_1.html#K4">*</a> <font color="Maroon">t</font> = 
<font color="Maroon">G</font> <a href="isocat_1.html#K2">*</a> <font color="Maroon">t</font>
<b>by </b><i>, <a class="ref" href="isocat_1.html#D7">ISOCAT_1:def 7</a></i>
<br/>.= 
<font color="Maroon">G</font> <a href="funct_1.html#NK3" target="_self">*</a> <font color="Maroon">t</font>
<b>by </b><i><a class="ref" href="isocat_2.html#T7" target="_self">Th7</a>, <a class="ref" href="isocat_1.html#D5">ISOCAT_1:def 5</a></i>
;<br/>


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