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f(x1, ..., xn) dx1 ... dxn,<br />

D<br />

D ⊆ R n <br />

gi(x1, ..., xn) ≤ 0 i = 1, ..., n gi : R n → R C 1 f : D → R <br />

D <br />

D = D1 ∪ ... ∪ DM D <br />

Dj<br />

D f D <br />

Dn ⊂ D D f <br />

f Dn In n → ∞<br />

In Dn → D <br />

f Dn <br />

<br />

<br />

<br />

f : X1 × X2 → R X1, X2<br />

R <br />

<br />

<br />

<br />

<br />

f(x1, x2) dx1 dx2 = f(x1, x2) dx2 dx1 = f(x1, x2) dx1 dx2.<br />

X1<br />

X2<br />

<br />

<br />

<br />

<br />

X, Y R n ϕ : X → Y <br />

C 1 A X B = ϕ(A) f : B → R <br />

B A <br />

B f B <br />

x ↦→ f(ϕ(x))| det Jac(ϕ)(x)|<br />

A <br />

<br />

<br />

f(y) dy = f(ϕ(x))| det Jac(ϕ)(x)| dx,<br />

B<br />

Jac(ϕ)(x) ϕ x<br />

<br />

A<br />

<br />

X2<br />

X1

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