Returns the variables appearing in f (as elements of the ring of f).
i1 : A = QQ{x,y,z,w}
o1 = A
o1 : NCPolynomialRing
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i2 : f = x^2+y^2+z^3
3 2 2
o2 = z +y +x
o2 : A
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i3 : sup = support f
o3 = {y, x, z}
o3 : List
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i4 : first sup o4 = y o4 : A |