EC Cryptography Tutorials - Herong's Tutorial Examples - v1.00, by Dr. Herong Yang
Subtraction Operation on an Elliptic Curve
This section describes the Subtraction operation on an elliptic curve. If the resulting point of the subtraction operation of point Q from P, then P - R = P + (-Q)..
With the introduction of the negation operation, we can easily define the subtraction operation on an elliptic curve as the following.
If we use the minus sign "-" as the negation operator, then the resulting point R of the subtraction operation of a point Q from P on an elliptic curve can be expressed as the following:
R = P - Q = P + (-P), where (-Q) is the negation operation of Q
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