Difference between revisions of "ApCoCoA-1:BB.ASneighbors"
From ApCoCoAWiki
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<command> | <command> | ||
<title>BB.ASneighbors</title> | <title>BB.ASneighbors</title> | ||
| − | <short_description>list of across-the-street neighbors</short_description> | + | <short_description>Compute a list of across-the-street neighbors.</short_description> |
<syntax> | <syntax> | ||
BB.ASneighbors(OO:LIST):LIST | BB.ASneighbors(OO:LIST):LIST | ||
Revision as of 16:20, 21 April 2009
BB.ASneighbors
Compute a list of across-the-street neighbors.
Syntax
BB.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 OO of terms that specify 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>.
Example
Use Q[x,y,z]; BB.ASneighbors([1,x]); [[1, 2, 2, 3], [3, 4, 2, 3], [3, 5, 1, 3], [4, 5, 1, 2]] -------------------------------
