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<b>let </b><font color="Maroon" title="c1">C</font>, <font color="Maroon" title="c2">B</font> be  non <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a> <a href="altcat_1.html#V2" title="ALTCAT_1:attr.2">transitive</a> <a href="altcat_1.html#V12" title="ALTCAT_1:attr.12">with_units</a>  <a href="altcat_1.html#L2" title="ALTCAT_1:struct.2">AltCatStr</a> ;<br/><b>let </b><font color="Maroon" title="c3">G1</font>, <font color="Maroon" title="c4">G2</font> be  <a href="functor0.html#V15" title="FUNCTOR0:attr.15">covariant</a>  <a href="functor0.html#M2" title="FUNCTOR0:mode.2">Functor</a> of <font color="Maroon" title="c2">B</font>,<font color="Maroon" title="c1">C</font>;<br/><b>let </b><font color="Maroon" title="c5">q</font> be    <a href="functor2.html#M1" title="FUNCTOR2:mode.1">transformation</a> of <font color="Maroon" title="c3">G1</font>,<font color="Maroon" title="c4">G2</font>;<br/>









<b>assume </b><a NAME="E1:40"/><i><font color="Green" title="E21">A1</font></i>: 
<font color="Maroon" title="c3">G1</font> <a href="functor2.html#R1" title="FUNCTOR2:pred.1">is_transformable_to</a> <font color="Maroon" title="c4">G2</font>
 ;<br/>

<a NAME="E2:40"/><b>then </b><i><font color="Green" title="E22">A2</font></i>: 
<font color="Maroon" title="c3">G1</font> <a href="functor3.html#K1" title="FUNCTOR3:func.1">*</a> <span class="p1">(<span class="default"><a href="functor0.html#K12" title="FUNCTOR0:func.12">id</a> <font color="Maroon" title="c2">B</font></span>)</span> <a href="functor2.html#R1" title="FUNCTOR2:pred.1">is_transformable_to</a> <font color="Maroon" title="c4">G2</font> <a href="functor3.html#K1" title="FUNCTOR3:func.1">*</a> <span class="p1">(<span class="default"><a href="functor0.html#K12" title="FUNCTOR0:func.12">id</a> <font color="Maroon" title="c2">B</font></span>)</span>
 
<b>by </b><i><a class="ref" href="functor3.html#T10" target="_self" title="FUNCTOR3:th.10">Th10</a></i>;<br/>
<b>thus </b><font color="Maroon" title="c5">q</font> <a href="functor3.html#K7" title="FUNCTOR3:func.7">(#)</a> <span class="p1">(<span class="default"><a href="functor2.html#K4" title="FUNCTOR2:func.4">idt</a> <span class="p2">(<span class="default"><a href="functor0.html#K12" title="FUNCTOR0:func.12">id</a> <font color="Maroon" title="c2">B</font></span>)</span></span>)</span> = 
<span class="p1">(<span class="default"><font color="Maroon" title="c5">q</font> <a href="functor3.html#K6" title="FUNCTOR3:func.6">*</a> <span class="p2">(<span class="default"><a href="functor0.html#K12" title="FUNCTOR0:func.12">id</a> <font color="Maroon" title="c2">B</font></span>)</span></span>)</span> <a href="functor2.html#K3" title="FUNCTOR2:func.3">`*`</a> <span class="p1">(<span class="default"><a href="functor2.html#K4" title="FUNCTOR2:func.4">idt</a> <span class="p2">(<span class="default"><font color="Maroon" title="c3">G1</font> <a href="functor3.html#K1" title="FUNCTOR3:func.1">*</a> <span class="p3">(<span class="default"><a href="functor0.html#K12" title="FUNCTOR0:func.12">id</a> <font color="Maroon" title="c2">B</font></span>)</span></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="functor3.html#T19" target="_self" title="FUNCTOR3:th.19">Th19</a></i>
<br/>.= 
<font color="Maroon" title="c5">q</font> <a href="functor3.html#K6" title="FUNCTOR3:func.6">*</a> <span class="p1">(<span class="default"><a href="functor0.html#K12" title="FUNCTOR0:func.12">id</a> <font color="Maroon" title="c2">B</font></span>)</span>
<b>by </b><i><a class="txt" href="functor3.html#E2:40"><i><font color="Green" title="E22">A2</font></i></a>, <a class="ref" href="functor2.html#T7" title="FUNCTOR2:th.7">FUNCTOR2:7</a></i>
<br/>.= 
<font color="Maroon" title="c5">q</font>
<b>by </b><i><a class="txt" href="functor3.html#E1:40"><i><font color="Green" title="E21">A1</font></i></a>, <a class="ref" href="functor3.html#T21" target="_self" title="FUNCTOR3:th.21">Th21</a></i>
;<br/>


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