ApCoCoA-1:BB.NDneighbors: Difference between revisions
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{{Version|1}} | |||
<command> | <command> | ||
<title>BB.NDneighbors</title> | |||
<short_description>Computes a list of next-door neighbors.</short_description> | |||
<syntax> | <syntax> | ||
BB.NDneighbors(OO:LIST):LIST | |||
</syntax> | </syntax> | ||
<description> | |||
This command computes the list of next-door neighbors in the border of the order ideal <tt>OO</tt>. The input is a list <tt>OO</tt> of terms that specify an order ideal. The output is a list of triples <tt>[i,j,k]</tt> such that <tt>b_i = x_k * b_j</tt> where the border terms <tt>b_i</tt> and <tt>b_j</tt> correspond to the <tt>i</tt>-th and <tt>j</tt>-th element of the list returned by the command <ref>ApCoCoA-1:BB.Border|BB.Border</ref>(OO). | |||
<itemize> | |||
<key> | <item>@param <em>OO</em> A list of terms representing an order ideal.</item> | ||
<item>@return A list of next-door neighbors of <tt>OO</tt>.</item> | |||
</itemize> | |||
<example> | |||
Use QQ[x,y,z]; | |||
BB.Border([1,x]); | |||
BB.NDneighbors([1,x]); | |||
[z, y, xz, xy, x^2] | |||
------------------------------- | |||
[[3, 1, 1], [4, 2, 1]] | |||
-- E.g. the first triple of the result can be interpreted | |||
-- as x*z = xz | |||
</example> | |||
</description> | |||
<types> | |||
<type>borderbasis</type> | |||
</types> | |||
<see>ApCoCoA-1:BB.ASneighbors|BB.ASneighbors</see> | |||
<key>NDneighbors</key> | |||
<key>BB.NDneighbors</key> | |||
<key>borderbasis.NDneighbors</key> | |||
<wiki-category>ApCoCoA-1:Package_borderbasis</wiki-category> | |||
</command> | </command> | ||
Latest revision as of 09:42, 7 October 2020
| This article is about a function from ApCoCoA-1. |
BB.NDneighbors
Computes a list of next-door neighbors.
Syntax
BB.NDneighbors(OO:LIST):LIST
Description
This command 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 [i,j,k] such that b_i = x_k * b_j where the border terms b_i and b_j correspond to the i-th and j-th element of the list returned by the command BB.Border(OO).
@param OO A list of terms representing an order ideal.
@return A list of next-door neighbors of OO.
Example
Use QQ[x,y,z]; BB.Border([1,x]); BB.NDneighbors([1,x]); [z, y, xz, xy, x^2] ------------------------------- [[3, 1, 1], [4, 2, 1]] -- E.g. the first triple of the result can be interpreted -- as x*z = xz
