ApCoCoA-1:BB.NDneighbors: Difference between revisions
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<key>borderbasis. | <key>borderbasis.NDneighbors</key> | ||
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Revision as of 18:51, 22 April 2009
BB.NDneighbors
Compute a list of next-door neighbors.
Syntax
BB.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>.
@param OO A list of terms representing an order ideal.
@return A list of next-door neighbors of OO.
Example
Use Q[x,y,z]; BB.NDneighbors([1,x]); [[3, 1, 1], [4, 2, 1]] -------------------------------
