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isConstant -- whether a ring element is constant

Synopsis

Usage:

isConstant f
Inputs:
- f
Outputs:
- whether f is constant, i.e., is in the coefficient ring

Description

i1 : isConstant 3

o1 = true

i2 : QQ[a,b][x,y];

i3 : isConstant (x+a-x)

o3 = true

i4 : isConstant x

o4 = false

Code

../../../../../Macaulay2/m2/rings.m2:102:26-102:66: --source code:
isConstant RingElement := r -> liftable(r, coefficientRing ring r)

See also

coefficientRing -- get the coefficient ring

Ways to use isConstant:

isConstant(RingElement)

For the programmer

The object isConstant is a method function.