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div F (x, y, z) = ∂xF1 + ∂yF2 + ∂zF3 = 2x + 1/2,<br />

⎛<br />

⎞<br />

rot F = det ⎝ e1 ∂x x2 e2 ∂y y/2 ⎠ = (0, −1, 0).<br />

e3 ∂z x<br />

<br />

D =<br />

{(x, 1, z) : x2 + z2 ≤ 2} (0, −1, 0) (0, −1, 0) D <br />

γ <br />

<br />

rot <br />

F · ˆn dσ = dσ = Area(D) = 2π.<br />

D<br />

<br />

2π<br />

F dγ = F ( √ 2 cos θ, 1, √ 2 sin θ) · (− √ 2 sin θ, 0, √ 2 cos θ) dθ<br />

γ<br />

=<br />

0<br />

2π<br />

0<br />

D<br />

<br />

− 2 3/2 cos 2 θ sin θ + 2 cos 2 <br />

θ dθ = 2π<br />

F

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