Difference between revisions of "ApCoCoA-1:BB.NDneighbors"
From ApCoCoAWiki
KHiddemann (talk | contribs) m (adding ring to the example) |
KHiddemann (talk | contribs) (fixing keys) |
||
| Line 15: | Line 15: | ||
</description> | </description> | ||
<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> | ||
</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]] -------------------------------
