Computes the difference of two points.
i1 : E=ellCurve(3,8,GF(13))
o1 = Elliptic Curve defined by Y^2 = X^3 + 3 X + (-5)( over(GF 13 .))
o1 : EllipticCurve
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i2 : P=ellPoint({1,5,1},E)
o2 = Point ({1, 5, 1}( on the (Elliptic Curve defined by Y^2 = X^3 + 3 X + (-5)( over(GF 13 .)))))
o2 : EllPoint
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i3 : Q=ellPoint({2,3,1},E)
o3 = Point ({2, 3, 1}( on the (Elliptic Curve defined by Y^2 = X^3 + 3 X + (-5)( over(GF 13 .)))))
o3 : EllPoint
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i4 : P-Q
o4 = Point ({-4, -6, 1}( on the (Elliptic Curve defined by Y^2 = X^3 + 3 X + (-5)( over(GF 13 .)))))
o4 : EllPoint
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