ApCoCoA-1:BB.ASneighbors: Difference between revisions
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<command> | <command> | ||
<title>BB.ASneighbors</title> | |||
<short_description>Compute a list of across-the-street neighbors.</short_description> | |||
<syntax> | <syntax>BB.ASneighbors(OO:LIST):LIST</syntax> | ||
BB.ASneighbors(OO:LIST):LIST | <description> | ||
</syntax> | |||
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 [i,j,k,l] such that x_k * b_i = x_l * b_j. | 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 [i,j,k,l] such that x_k * b_i = x_l * b_j. | ||
<itemize> | <itemize> | ||
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------------------------------- | ------------------------------- | ||
</example> | </example> | ||
</description> | |||
<types> | <types> | ||
<type>list</type> | <type>list</type> | ||
</types> | </types> | ||
<see>BB.NDneighbors</see> | |||
<key>ASneighbors</key> | |||
<key>BB.ASneighbors</key> | |||
<key>borderbasis.ASneighbors</key> | |||
<wiki-category>Package_borderbasis</wiki-category> | |||
</command> | </command> | ||
Revision as of 10:57, 24 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 [i,j,k,l] such that x_k * b_i = x_l * b_j.
@param OO A list of terms representing an order ideal.
@return A list of across-the-street neighbors of OO.
Example
Use QQ[x,y,z]; BB.ASneighbors([1,x]); [[1, 2, 2, 3], [3, 4, 2, 3], [3, 5, 1, 3], [4, 5, 1, 2]] -------------------------------
