isConstant(NCRingElement) -- Returns whether the NCRingElement is constant

Synopsis

• Function: isConstant

• Usage:

  t = isConstant f

• Inputs:
  • f, an instance of the type NCRingElement
• Outputs:
  • t, a Boolean value

Description

i1 : A = QQ{x,y,z,w}

o1 = A

o1 : NCPolynomialRing

i2 : f = x^2+y^2+2*z^3

       3  2  2
o2 = 2z +y +x

o2 : A

i3 : isConstant f

o3 = false

i4 : g = promote(1,A)

o4 = 1

o4 : A

i5 : isConstant g

o5 = true