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<b>take </b>
<span class="p1"><a href="matrix_2.html#K4" title="MATRIX_2:func.4">&lt;*</a><span class="default"><a href="numbers.html#K6" title="NUMBERS:func.6">0</a> </span><a href="matrix_2.html#K4" title="MATRIX_2:func.4">*&gt;</a></span>
;<br/>

<b>thus </b><a NAME="E1:6_1_1"/>
( not <span class="p1"><a href="matrix_2.html#K4" title="MATRIX_2:func.4">&lt;*</a><span class="default"><a href="numbers.html#K6" title="NUMBERS:func.6">0</a> </span><a href="matrix_2.html#K4" title="MATRIX_2:func.4">*&gt;</a></span> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> &amp; <span class="p1"><a href="matrix_2.html#K4" title="MATRIX_2:func.4">&lt;*</a><span class="default"><a href="numbers.html#K6" title="NUMBERS:func.6">0</a> </span><a href="matrix_2.html#K4" title="MATRIX_2:func.4">*&gt;</a></span> is <a href="funct_1.html#V3" title="FUNCT_1:attr.3">constant</a> )
 ;<br/>


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