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<b>let </b><font color="Maroon">c<sub>3</sub></font> be    <a href="functor0.html#L1" target="_self">BimapStr</a> of <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font>;<br/>

<b>assume </b><a NAME="E1:113_1_1"/>
<font color="Maroon">c<sub>3</sub></font> is <a href="functor0.html#V10" target="_self">Covariant</a>
 ;<br/>

<a NAME="E2:113_1_1"/><b>then </b>
the <a href="functor0.html#U1" target="_self">ObjectMap</a> of <font color="Maroon">c<sub>3</sub></font> is <a href="functor0.html#V1" target="_self">Covariant</a>
 
<b>by </b><i><a class="ref" href="functor0.html#D13" target="_self">Def13</a></i>;<br/>
<a NAME="E3:113_1_1"/><b>then </b>
ex <font color="Olive">b<sub>1</sub></font> being  <a href="funct_2.html#NM1">Function</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>1</sub></font>,the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>2</sub></font> st the <a href="functor0.html#U1" target="_self">ObjectMap</a> of <font color="Maroon">c<sub>3</sub></font> <a href="funct_2.html#R2">=</a> <span class="p1"><a href="funct_3.html#K16">[:</a><span class="default"><font color="Olive">b<sub>1</sub></font>,<font color="Olive">b<sub>1</sub></font></span><a href="funct_3.html#K16">:]</a></span>
 
<b>by </b><i><a class="ref" href="functor0.html#D2" target="_self">Def2</a></i>;<br/>
<b>hence </b><a NAME="E4:113_1_1"/>
the <a href="functor0.html#U1" target="_self">ObjectMap</a> of <font color="Maroon">c<sub>3</sub></font> <a href="relset_1.html#K10">.:</a> <span class="p1">(<span class="default"><a href="partfun1.html#K6">id</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="tarski.html#R1">c=</a>  <a href="partfun1.html#K6">id</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>2</sub></font>
 <b>by </b><i><a class="ref" href="functor0.html#T15" target="_self">Th15</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="functor0.html#D9" target="_self">FUNCTOR0:def 9</a><br/>


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