# Difference between revisions of "ApCoCoA-1:BB.NDneighbors"

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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>. | 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>. | ||

+ | <itemize> | ||

+ | <item>@param <em>OO</em> A list of terms representing an order ideal.</item> | ||

+ | <item>@return A list of next-door neighbors of OO.</item> | ||

+ | </itemize> | ||

<example> | <example> | ||

Use Q[x,y,z]; | Use Q[x,y,z]; |

## Revision as of 16:23, 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]] -------------------------------