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isConstant -- whether a ring element is constant

Synopsis

Usage:
isConstant f
Inputs:
- f
Outputs:
- a Boolean value, 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

See also

coefficientRing -- get the coefficient ring

Ways to use `isConstant` :

isConstant(RingElement)

Code

-- ../../../../Macaulay2/m2/enginering.m2:530
isConstant RingElement := r -> r == 0 or all(degree r, i -> i === 0)