# Difference between revisions of "ApCoCoA-1:NCo.BInterreduction"

## NCo.BInterreduction

Interreduce a LIST of polynomials in a free monoid ring over the binary field.

### Syntax

NCo.BInterreduction(G:LIST):LIST

### Description

Note that, given a word ordering, a set G of non-zero polynomials is called interreduced if no element of Supp(g) is contained in the leading word ideal BLW(G\{g}) for all g in G.

Please note: The function(s) explained on this page is/are using the ApCoCoAServer. You will have to start the ApCoCoAServer in order to use it/them.

Please set ring environment alphabet (or set of indeterminates) X and word ordering via the functions NCo.SetX and NCo.SetOrdering, respectively, before calling this function. The default ordering is length-lexicographic ordering ("LLEX"). For more information, please check the relevant functions.

• @param G: a LIST of polynomials in the free monoid ring F_{2}<X>. Each polynomial is represented as a LIST of words (or terms) in <X>. Each word is represented as a STRING. For example, xy^2x is represented as "xyyx", and the identity is represented as the empty string "". Thus, the polynomial f=xy-y+1 is represented as F:=["xy", "y", ""]. The zero polynomial 0 is represented as the empty LIST [].

• @return: a LIST of interreduced polynomials.

#### Example

NCo.SetX("abc");
NCo.SetOrdering("ELIM");
Polynomials:=[["ba","c"],["b",""], ["c"]];
NCo.BInterreduction(Polynomials);

[["a"], ["b", ""], ["c"]]
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