ApCoCoA-1:BB.NDneighbors: Difference between revisions
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<see>borderbasis.ASneighbors</see> | <see>borderbasis.ASneighbors</see> | ||
<key> | <key>kreuzer</key> | ||
<key>borderbasis.ndneighbors</key> | <key>borderbasis.ndneighbors</key> | ||
<wiki-category>Package_borderbasis</wiki-category> | <wiki-category>Package_borderbasis</wiki-category> | ||
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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]] -------------------------------
