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<b>let </b><font color="Maroon" title="c1">K</font> be   <a href="vectsp_1.html#NM3" title="VECTSP_1:NM.3">Field</a>;<br/><b>let </b><font color="Maroon" title="c2">V1</font>, <font color="Maroon" title="c3">V2</font> be  <a href="matrlin.html#V2" title="MATRLIN:attr.2">finite-dimensional</a> <a href="vectsp_1.html#NM7" title="VECTSP_1:NM.7">VectSp</a> of <font color="Maroon" title="c1">K</font>;<br/><b>let </b><font color="Maroon" title="c4">f</font> be   <a href="struct_0.html#NM6" title="STRUCT_0:NM.6">Function</a> of <font color="Maroon" title="c2">V1</font>,<font color="Maroon" title="c3">V2</font>;<br/><b>let </b><font color="Maroon" title="c5">b1</font> be    <a href="matrlin.html#M1" title="MATRLIN:mode.1">OrdBasis</a> of <font color="Maroon" title="c2">V1</font>;<br/><b>let </b><font color="Maroon" title="c6">b2</font> be    <a href="matrlin.html#M1" title="MATRLIN:mode.1">OrdBasis</a> of <font color="Maroon" title="c3">V2</font>;<br/>











<b>assume </b><a NAME="E1:61"/>
 <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <font color="Maroon" title="c5">b1</font> <a href="xxreal_0.html#NR4" title="XXREAL_0:NR.4">&gt;</a> 0
 ;<br/>

<a NAME="E2:61"/><b>then </b>
 <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <span class="p1">(<span class="default"><a href="matrlin.html#K12" title="MATRLIN:func.12">AutMt</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c5">b1</font>,<font color="Maroon" title="c6">b2</font></span>)</span> <a href="xxreal_0.html#NR4" title="XXREAL_0:NR.4">&gt;</a> 0
 
<b>by </b><i><a class="ref" href="matrlin.html#D10" target="_self" title="MATRLIN:def.10">Def10</a></i>;<br/>
<b>then consider </b><font color="Maroon" title="c7">s</font> being   <a href="finseq_1.html#NM1" title="FINSEQ_1:NM.1">FinSequence</a><b> such that </b><br/><a NAME="E4:61"/><i><font color="Green" title="E50">A1</font></i>: 
( <font color="Maroon" title="c7">s</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="relat_1.html#K2" title="RELAT_1:func.2">rng</a> <span class="p1">(<span class="default"><a href="matrlin.html#K12" title="MATRLIN:func.12">AutMt</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c5">b1</font>,<font color="Maroon" title="c6">b2</font></span>)</span> &amp;  <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <font color="Maroon" title="c7">s</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="matrix_1.html#K1" title="MATRIX_1:func.1">width</a> <span class="p1">(<span class="default"><a href="matrlin.html#K12" title="MATRLIN:func.12">AutMt</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c5">b1</font>,<font color="Maroon" title="c6">b2</font></span>)</span> )
 <b>by </b><i><a class="ref" href="matrix_1.html#D4" title="MATRIX_1:def.4">MATRIX_1:def 4</a></i>;<br/>
<b>consider </b><font color="Maroon" title="c8">i</font> being    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a> <b> such that </b><br/><a NAME="E6:61"/><i><font color="Green" title="E51">A2</font></i>: 
( <font color="Maroon" title="c8">i</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="relat_1.html#K1" title="RELAT_1:func.1">dom</a> <span class="p1">(<span class="default"><a href="matrlin.html#K12" title="MATRLIN:func.12">AutMt</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c5">b1</font>,<font color="Maroon" title="c6">b2</font></span>)</span> &amp; <span class="p1">(<span class="default"><a href="matrlin.html#K12" title="MATRLIN:func.12">AutMt</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c5">b1</font>,<font color="Maroon" title="c6">b2</font></span>)</span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c8">i</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c7">s</font> )
 <b>by </b><i><a class="txt" href="matrlin.html#E4:61"><i><font color="Green" title="E50">A1</font></i></a>, <a class="ref" href="finseq_2.html#T11" title="FINSEQ_2:th.11">FINSEQ_2:11</a></i>;<br/>
<a NAME="E7:61"/>
 <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <span class="p1">(<span class="default"><a href="matrlin.html#K12" title="MATRLIN:func.12">AutMt</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c5">b1</font>,<font color="Maroon" title="c6">b2</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <font color="Maroon" title="c5">b1</font>
 
<b>by </b><i><a class="ref" href="matrlin.html#D10" target="_self" title="MATRLIN:def.10">Def10</a></i>;<br/>
<a NAME="E8:61"/><b>then </b><i><font color="Green" title="E52">A3</font></i>: 
<font color="Maroon" title="c8">i</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="relat_1.html#K1" title="RELAT_1:func.1">dom</a> <font color="Maroon" title="c5">b1</font>
 
<b>by </b><i><a class="txt" href="matrlin.html#E6:61"><i><font color="Green" title="E51">A2</font></i></a>, <a class="ref" href="finseq_3.html#T31" title="FINSEQ_3:th.31">FINSEQ_3:31</a></i>;<br/>
<font color="Maroon" title="c7">s</font> = 
<span class="p1">(<span class="default"><a href="matrlin.html#K12" title="MATRLIN:func.12">AutMt</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c5">b1</font>,<font color="Maroon" title="c6">b2</font></span>)</span> <a href="matrlin.html#K1" title="MATRLIN:func.1">/.</a> <font color="Maroon" title="c8">i</font>
<b>by </b><i><a class="txt" href="matrlin.html#E6:61"><i><font color="Green" title="E51">A2</font></i></a>, <a class="ref" href="finseq_4.html#D4" title="FINSEQ_4:def.4">FINSEQ_4:def 4</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon" title="c4">f</font> <a href="funct_2.html#K3" title="FUNCT_2:func.3">.</a> <span class="p2">(<span class="default"><font color="Maroon" title="c5">b1</font> <a href="finseq_4.html#K4" title="FINSEQ_4:func.4">/.</a> <font color="Maroon" title="c8">i</font></span>)</span></span>)</span> <a href="matrlin.html#K11" title="MATRLIN:func.11">|--</a> <font color="Maroon" title="c6">b2</font>
<b>by </b><i><a class="txt" href="matrlin.html#E8:61"><i><font color="Green" title="E52">A3</font></i></a>, <a class="ref" href="matrlin.html#D10" target="_self" title="MATRLIN:def.10">Def10</a></i>
;<br/>
<b>hence </b><a NAME="E10:61"/>
 <a href="matrix_1.html#K1" title="MATRIX_1:func.1">width</a> <span class="p1">(<span class="default"><a href="matrlin.html#K12" title="MATRLIN:func.12">AutMt</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c5">b1</font>,<font color="Maroon" title="c6">b2</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <font color="Maroon" title="c6">b2</font>
 <b>by </b><i><a class="txt" href="matrlin.html#E4:61"><i><font color="Green" title="E50">A1</font></i></a>, <a class="ref" href="matrlin.html#D9" target="_self" title="MATRLIN:def.9">Def9</a></i>;<br/>


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