Difference between revisions of "ApCoCoA-1:NC.IsHomog"
| Line 2: | Line 2: | ||
<title>NC.IsHomog</title> | <title>NC.IsHomog</title> | ||
<short_description> | <short_description> | ||
| − | Check whether a polynomial of a list of polynomials is homogeneous | + | Check whether a polynomial of a list of polynomials is homogeneous in a free monoid ring. |
</short_description> | </short_description> | ||
<syntax> | <syntax> | ||
| Line 41: | Line 41: | ||
<see>NC.Interreduction</see> | <see>NC.Interreduction</see> | ||
<see>NC.Intersection</see> | <see>NC.Intersection</see> | ||
| + | <see>NC.IsFinite</see> | ||
<see>NC.IsGB</see> | <see>NC.IsGB</see> | ||
<see>NC.IsHomog</see> | <see>NC.IsHomog</see> | ||
| Line 58: | Line 59: | ||
<see>NC.SetX</see> | <see>NC.SetX</see> | ||
<see>NC.Subtract</see> | <see>NC.Subtract</see> | ||
| + | <see>NC.TruncatedGB</see> | ||
<see>NC.UnsetFp</see> | <see>NC.UnsetFp</see> | ||
<see>NC.UnsetOrdering</see> | <see>NC.UnsetOrdering</see> | ||
Revision as of 15:32, 8 June 2012
NC.IsHomog
Check whether a polynomial of a list of polynomials is homogeneous in a free monoid ring.
Syntax
NC.IsHomog(F:LIST):BOOL
Description
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 coefficient field K, alphabet (or set of indeterminates) X and ordering via the functions NC.SetFp, NC.SetX and NC.SetOrdering, respectively, before calling the function. The default coefficient field is Q. The default ordering is length-lexicographic ordering ("LLEX"). For more information, please check the relevant functions.
@param F: a polynomial or a LIST of polynomials in K<X>. Each polynomial is represented as a LIST of monomials, which are pairs of the form [C, W] where W is a word in <X> and C is the coefficient of W. For example, the polynomial F=xy-y+1 is represented as F:=[[1,"xy"], [-1, "y"], [1,""]]. The zero polynomial 0 is represented as the empty LIST [].
@return: a BOOL value which is True if F is homogeneous and False otherwise. Note that if F is a set of homogeneous polynomials, then F generates a homogeneous ideal. It is false contrarily.
Example
NC.SetX(<quotes>xy</quotes>); F1 := [[1,<quotes>x</quotes>], [1,<quotes>y</quotes>]]; F2 := [[1,<quotes>xx</quotes>],[1,<quotes>xy</quotes>],[1,<quotes>x</quotes>]]; F := [F1,F2]; NC.IsHomog(F); False ------------------------------- NC.IsHomog(F1); True ------------------------------- NC.IsHomog(F2); False -------------------------------
See also
