In physics and mathematics, Green's Theorem gives the relationship between a line integral around a simple closed curve C and a double integral over the plane region D bounded by C. Green's Theorem was named after British scientist George Green, and is based on Stokes' theorem. The theorem states:
If we show Equations 1 and 2
If we express D as a region such that:
Proof of Green's Theorem, General Edition
Proof of Green's Theorem when D is a simple region
and
are true, we would prove Green's Theorem.
where g1 and g2 are continuous functions, we can compute the double integral of equation 1:
Now we break up C as the union of four curves: C1, C2, C3, C4.
With C1, use the parametric equations, x = x, y = g1(x), a ≤ x ≤ b. Therefore:
With -C3, use the parametric equations, x = x, y = g2(x), a ≤ x ≤ b. Therefore:
With C2 and C4, x is a constant, meaning:
Therefore,
Combining this with equation 4, we get:
A similar proof can be employed on Eq.2.