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<b>let </b><font color="Maroon" title="c1">R</font> be   <a href="funcsdom.html#NM1" title="FUNCSDOM:NM.1">Ring</a>;<br/><b>let </b><font color="Maroon" title="c2">V</font> be   <a href="vectsp_2.html#NM7" title="VECTSP_2:NM.7">RightMod</a> of <font color="Maroon" title="c1">R</font>;<br/><b>let </b><font color="Maroon" title="c3">W1</font>, <font color="Maroon" title="c4">W2</font> be    <a href="rmod_2.html#M1" title="RMOD_2:mode.1">Submodule</a> of <font color="Maroon" title="c2">V</font>;<br/><b>let </b><font color="Maroon" title="c5">v</font> be   <a href="vectsp_2.html#NM5" title="VECTSP_2:NM.5">Vector</a> of <font color="Maroon" title="c2">V</font>;<br/>









<b>assume </b><a NAME="E1:61"/><i><font color="Green" title="E42">A1</font></i>: 
<font color="Maroon" title="c2">V</font> <a href="rmod_3.html#R1" title="RMOD_3:pred.1">is_the_direct_sum_of</a> <font color="Maroon" title="c3">W1</font>,<font color="Maroon" title="c4">W2</font>
 ;<br/>

<a NAME="E2:61"/><b>then </b><i><font color="Green" title="E43">A2</font></i>: 
( <font color="Maroon" title="c5">v</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon" title="c5">v</font> <a href="rmod_3.html#K4" title="RMOD_3:func.4">|--</a> <font color="Maroon" title="c3">W1</font>,<font color="Maroon" title="c4">W2</font></span>)</span> <a href="domain_1.html#K2" title="DOMAIN_1:func.2">`1</a> </span>)</span> <a href="rlvect_1.html#K3" title="RLVECT_1:func.3">+</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon" title="c5">v</font> <a href="rmod_3.html#K4" title="RMOD_3:func.4">|--</a> <font color="Maroon" title="c3">W1</font>,<font color="Maroon" title="c4">W2</font></span>)</span> <a href="domain_1.html#K3" title="DOMAIN_1:func.3">`2</a> </span>)</span> &amp; <span class="p1">(<span class="default"><font color="Maroon" title="c5">v</font> <a href="rmod_3.html#K4" title="RMOD_3:func.4">|--</a> <font color="Maroon" title="c3">W1</font>,<font color="Maroon" title="c4">W2</font></span>)</span> <a href="domain_1.html#K2" title="DOMAIN_1:func.2">`1</a>  <a href="struct_0.html#R1" title="STRUCT_0:pred.1">in</a> <font color="Maroon" title="c3">W1</font> &amp; <span class="p1">(<span class="default"><font color="Maroon" title="c5">v</font> <a href="rmod_3.html#K4" title="RMOD_3:func.4">|--</a> <font color="Maroon" title="c3">W1</font>,<font color="Maroon" title="c4">W2</font></span>)</span> <a href="domain_1.html#K3" title="DOMAIN_1:func.3">`2</a>  <a href="struct_0.html#R1" title="STRUCT_0:pred.1">in</a> <font color="Maroon" title="c4">W2</font> )
 
<b>by </b><i><a class="ref" href="rmod_3.html#D5" target="_self" title="RMOD_3:def.5">Def5</a></i>;<br/>
<a NAME="E3:61"/><i><font color="Green" title="E44">A3</font></i>: 
<font color="Maroon" title="c2">V</font> <a href="rmod_3.html#R1" title="RMOD_3:pred.1">is_the_direct_sum_of</a> <font color="Maroon" title="c4">W2</font>,<font color="Maroon" title="c3">W1</font>
 
<b>by </b><i><a class="txt" href="rmod_3.html#E1:61"><i><font color="Green" title="E42">A1</font></i></a>, <a class="ref" href="rmod_3.html#T46" target="_self" title="RMOD_3:th.46">Th46</a></i>;<br/>
<a NAME="E4:61"/><b>then </b><i><font color="Green" title="E45">A4</font></i>: 
<font color="Maroon" title="c5">v</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon" title="c5">v</font> <a href="rmod_3.html#K4" title="RMOD_3:func.4">|--</a> <font color="Maroon" title="c4">W2</font>,<font color="Maroon" title="c3">W1</font></span>)</span> <a href="domain_1.html#K3" title="DOMAIN_1:func.3">`2</a> </span>)</span> <a href="rlvect_1.html#K3" title="RLVECT_1:func.3">+</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon" title="c5">v</font> <a href="rmod_3.html#K4" title="RMOD_3:func.4">|--</a> <font color="Maroon" title="c4">W2</font>,<font color="Maroon" title="c3">W1</font></span>)</span> <a href="domain_1.html#K2" title="DOMAIN_1:func.2">`1</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="rmod_3.html#D5" target="_self" title="RMOD_3:def.5">Def5</a></i>;<br/>
<a NAME="E5:61"/>
( <span class="p1">(<span class="default"><font color="Maroon" title="c5">v</font> <a href="rmod_3.html#K4" title="RMOD_3:func.4">|--</a> <font color="Maroon" title="c4">W2</font>,<font color="Maroon" title="c3">W1</font></span>)</span> <a href="domain_1.html#K2" title="DOMAIN_1:func.2">`1</a>  <a href="struct_0.html#R1" title="STRUCT_0:pred.1">in</a> <font color="Maroon" title="c4">W2</font> &amp; <span class="p1">(<span class="default"><font color="Maroon" title="c5">v</font> <a href="rmod_3.html#K4" title="RMOD_3:func.4">|--</a> <font color="Maroon" title="c4">W2</font>,<font color="Maroon" title="c3">W1</font></span>)</span> <a href="domain_1.html#K3" title="DOMAIN_1:func.3">`2</a>  <a href="struct_0.html#R1" title="STRUCT_0:pred.1">in</a> <font color="Maroon" title="c3">W1</font> )
 
<b>by </b><i><a class="txt" href="rmod_3.html#E3:61"><i><font color="Green" title="E44">A3</font></i></a>, <a class="ref" href="rmod_3.html#D5" target="_self" title="RMOD_3:def.5">Def5</a></i>;<br/>
<b>hence </b><a NAME="E6:61"/>
<span class="p1">(<span class="default"><font color="Maroon" title="c5">v</font> <a href="rmod_3.html#K4" title="RMOD_3:func.4">|--</a> <font color="Maroon" title="c3">W1</font>,<font color="Maroon" title="c4">W2</font></span>)</span> <a href="domain_1.html#K3" title="DOMAIN_1:func.3">`2</a>  <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><font color="Maroon" title="c5">v</font> <a href="rmod_3.html#K4" title="RMOD_3:func.4">|--</a> <font color="Maroon" title="c4">W2</font>,<font color="Maroon" title="c3">W1</font></span>)</span> <a href="domain_1.html#K2" title="DOMAIN_1:func.2">`1</a> 
 <b>by </b><i><a class="txt" href="rmod_3.html#E1:61"><i><font color="Green" title="E42">A1</font></i></a>, <a class="txt" href="rmod_3.html#E2:61"><i><font color="Green" title="E43">A2</font></i></a>, <a class="txt" href="rmod_3.html#E4:61"><i><font color="Green" title="E45">A4</font></i></a>, <a class="ref" href="rmod_3.html#T51" target="_self" title="RMOD_3:th.51">Th51</a></i>;<br/>


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