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<b>let </b><font color="Maroon" title="c1">n</font>, <font color="Maroon" title="c2">m</font> be    <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> ;<br/>

<b>assume </b><a NAME="E1:70"/><i><font color="Green" title="E49">A1</font></i>: 
<font color="Maroon" title="c1">n</font> <a href="xxreal_0.html#NR4" title="XXREAL_0:NR.4">&gt;</a>  <a href="numbers.html#K6" title="NUMBERS:func.6">0</a> 
 ;<br/>

<a NAME="E2:70"/><b>then </b><i><font color="Green" title="E50">A2</font></i>: 
 <a href="matrix_1.html#K1" title="MATRIX_1:func.1">width</a> <span class="p1">(<span class="default"><a href="matrixr1.html#K8" title="MATRIXR1:func.8">0_Rmatrix</a> <font color="Maroon" title="c1">n</font>,<font color="Maroon" title="c2">m</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">m</font>
 
<b>by </b><i><a class="ref" href="matrix_1.html#T24" title="MATRIX_1:th.24">MATRIX_1:24</a></i>;<br/>
<a NAME="E3:70"/>
 <a href="finseq_1.html#K3" title="FINSEQ_1:func.3">len</a> <span class="p1">(<span class="default"><a href="matrixr1.html#K8" title="MATRIXR1:func.8">0_Rmatrix</a> <font color="Maroon" title="c1">n</font>,<font color="Maroon" title="c2">m</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c1">n</font>
 
<b>by </b><i><a class="txt" href="matrixr2.html#E1:70"><i><font color="Green" title="E49">A1</font></i></a>, <a class="ref" href="matrix_1.html#T24" title="MATRIX_1:th.24">MATRIX_1:24</a></i>;<br/>
<a NAME="E4:70"/><b>then </b>
<span class="p1">(<span class="default"><a href="numbers.html#K6" title="NUMBERS:func.6">0</a>  <a href="real_1.html#K7" title="REAL_1:func.7">+</a> <a href="numbers.html#K6" title="NUMBERS:func.6">0</a> </span>)</span> <a href="matrixr1.html#K7" title="MATRIXR1:func.7">*</a> <span class="p1">(<span class="default"><a href="matrixr1.html#K8" title="MATRIXR1:func.8">0_Rmatrix</a> <font color="Maroon" title="c1">n</font>,<font color="Maroon" title="c2">m</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="matrixr1.html#K8" title="MATRIXR1:func.8">0_Rmatrix</a> <font color="Maroon" title="c1">n</font>,<font color="Maroon" title="c2">m</font>
 
<b>by </b><i><a class="txt" href="matrixr2.html#E1:70"><i><font color="Green" title="E49">A1</font></i></a>, <a class="txt" href="matrixr2.html#E2:70"><i><font color="Green" title="E50">A2</font></i></a>, <a class="ref" href="matrixr1.html#T44" title="MATRIXR1:th.44">MATRIXR1:44</a></i>;<br/>
<b>hence </b><a NAME="E5:70"/>
<span class="p1">(<span class="default"><a href="matrixr1.html#K8" title="MATRIXR1:func.8">0_Rmatrix</a> <font color="Maroon" title="c1">n</font>,<font color="Maroon" title="c2">m</font></span>)</span> <a href="matrixr1.html#K3" title="MATRIXR1:func.3">+</a> <span class="p1">(<span class="default"><a href="matrixr1.html#K8" title="MATRIXR1:func.8">0_Rmatrix</a> <font color="Maroon" title="c1">n</font>,<font color="Maroon" title="c2">m</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="matrixr1.html#K8" title="MATRIXR1:func.8">0_Rmatrix</a> <font color="Maroon" title="c1">n</font>,<font color="Maroon" title="c2">m</font>
 <b>by </b><i><a class="ref" href="matrixr2.html#T12" target="_self" title="MATRIXR2:th.12">Th12</a></i>;<br/>


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