Difference between revisions of "ApCoCoA-1:BB.NDneighbors"

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     </description>
 
     </description>
 
     <see>borderbasis.ASneighbors</see>
 
     <see>borderbasis.ASneighbors</see>
     <key>Kreuzer</key>
+
     <key>kreuzer</key>
 
     <key>borderbasis.ndneighbors</key>
 
     <key>borderbasis.ndneighbors</key>
    <key>borderbasisndneighbors</key>
 
 
     <wiki-category>Package_borderbasis</wiki-category>
 
     <wiki-category>Package_borderbasis</wiki-category>
 
</command>
 
</command>

Revision as of 12:05, 8 November 2007

borderbasis.NDneighbors

list of next-door neighbors

Syntax

$borderbasis.NDneighbors(OO:LIST):LIST

Description

Computes the list of next-door neighbors in the border of the order ideal OO. The input is a list OO of terms that specify an order ideal. The output is a list of triples <formula>[i,j,k]</formula> such that <formula>b_i = x_k * b_j</formula>.

Example

Use Q[x,y,z];
$borderbasis.NDneighbors([1,x]);
[[3, 1, 1], [4, 2, 1]]
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borderbasis.ASneighbors