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<a NAME="E1:60_1_1"/>
 <a href="cat_1.html#K6" target="_self">Hom</a> <font color="Maroon">b</font>,<font color="Maroon">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a> 
 
<b>by </b><i><a class="ref" href="cat_1.html#T22" target="_self">Th22</a>, <a class="ref" href="cat_1.html#T23" target="_self">Th23</a>, <a class="ref" href="cat_1.html#T18" target="_self">Th18</a></i>;<br/>
<b>hence </b><a NAME="E2:60_1_1"/>
for <font color="Olive">b<sub>1</sub></font>, <font color="Olive">b<sub>2</sub></font> being   <a href="cat_1.html#M1" target="_self">Morphism</a> of <font color="Maroon">b</font>,<font color="Maroon">a</font>  st <font color="Maroon">f</font> <a href="cat_1.html#K9" target="_self">*</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10" target="_self">id</a> <font color="Maroon">b</font> &amp; <font color="Olive">b<sub>1</sub></font> <a href="cat_1.html#K9" target="_self">*</a> <font color="Maroon">f</font> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10" target="_self">id</a> <font color="Maroon">a</font> &amp; <font color="Maroon">f</font> <a href="cat_1.html#K9" target="_self">*</a> <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10" target="_self">id</a> <font color="Maroon">b</font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="cat_1.html#K9" target="_self">*</a> <font color="Maroon">f</font> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10" target="_self">id</a> <font color="Maroon">a</font> holds <br/><font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>2</sub></font>
 <b>by </b><i><a class="ref" href="cat_1.html#T22" target="_self">Th22</a>, <a class="ref" href="cat_1.html#D7" target="_self">Def7</a></i>;<br/>


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