# ApCoCoA-1:BB.NDneighbors

From ApCoCoAWiki

## borderbasis.NDneighbors

computes list of next-door neighbors

### Syntax

$borderbasis.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 of terms OO 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>.

#### Example

NDneighbors([1,x]); [[3, 1, 1], [4, 2, 1]] -------------------------------