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<B>GSPOLY</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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syntax: </H3>
<em>gspoly</em>(&lt;p1&gt;,&lt;p2&gt;); 
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where &lt;p1&gt; and &lt;p2&gt; are polynomials. 
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The <em>subtraction</em> polynomial of p1 and p2 is computed 
corresponding to the method of the Buchberger algorithm for 
computing <em>groebner bases</em>: p1 and p2 are multiplied 
with terms such that when subtracting them the leading terms 
cancel each other. 
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