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Macaulay2Doc :: isConstant

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/enginering.m2:671:29-671:65: --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.