Package sagbi/SB.GetLTSA
From ApCoCoAWiki
| This article is about a function from ApCoCoA-2. |
SB.GetLTSA
This function returns the leading term subalgebra of a given Subalgebra.
Syntax
SB.GetLTSA(ref S: TAGGED(<quotes>$apcocoa/sagbi.Subalgebra</quotes>)): TAGGED(<quotes>$apcocoa/sagbi.Subalgebra</quotes>)
Description
Returns the leading term subalgebra of S, i.e. the subalgebra generated by all terms appearing as the leading term of a polynomial in S.
Note: Calling the function more than once results in equal subalgebras with different IDs.
@param S A subalgebra
@return the leading term subalgebra of S
Example
Use R ::= QQ[x,y,z]; S := SB.Subalgebra(R,[x^2,x^2+y]); PrintLn SB.GetLTSA(ref S); -- SubalgebraWithID(2, QQ[y, x^2]) of RingWithID(1311, "QQ[x,y,z]") PrintLn SB.GetLTSA(ref S); -- SubalgebraWithID(3, QQ[y, x^2]) of RingWithID(1311, "QQ[x,y,z]")
See also
Package sagbi/SB.GetTruncSAGBI
