next | previous | forward | backward | up | top | index | toc | Macaulay2 website

GKMVarieties :: makeCharacterRing

makeCharacterRing -- constructs the character ring of a torus

Synopsis

Usage:

makeCharacterRing n
Inputs:
- n, an integer
Outputs:
- a ring, with n variables and inverses are allowed

Description

Given an integer n, this method outputs the character ring of T = $(\mathbb C^*)^n$.

i1 : R = makeCharacterRing 4

o1 = R

o1 : PolynomialRing

i2 : describe R

o2 = ZZ[T ..T , Degrees => {4:1}, MonomialOrder => {MonomialSize => 32}, DegreeRank => 1, Inverses => true]
         0   3                                     {Weights => {4:1}  }
                                                   {GroupLex => 4     }
                                                   {Position => Up    }

Ways to use `makeCharacterRing` :

"makeCharacterRing(ZZ)"

For the programmer

The object makeCharacterRing is a method function.