ApCoCoA-1:BB.ASneighbors
From ApCoCoAWiki
borderbasis.ASneighbors
compute list of across-the-street neighbors
Syntax
$borderbasis.ASneighbors(OO:LIST):LIST
Description
Computes the list of across-the-street neighbors in the border of the order ideal OO. The input is a list of terms OO that specifies an order ideal. The output is a list of quadruples <formula>[i,j,k,l]</formula> such that <formula>x_k * b_i = x_l * b_j</formula>.
