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TEOREMA DI STOKES (circuitazione di F lungo una curva chiusa ∂ S ):<br />
Sia F =<br />
S<br />
( F)<br />
Γ : D ⊂ ℜ<br />
( Γ)<br />
+ ∂D<br />
=<br />
+ ∂S<br />
=<br />
( f , f , f )<br />
Il flusso del rotore di<br />
rot<br />
+ ∂S=<br />
Ω<br />
=<br />
F =<br />
b<br />
a<br />
F = −<br />
x = x<br />
y = y<br />
z = z<br />
u =<br />
v =<br />
x = x<br />
y = y<br />
z = z<br />
n<br />
1<br />
i<br />
∂<br />
=<br />
∂x<br />
f<br />
2<br />
i=<br />
1<br />
−Ω + Ω<br />
F<br />
1<br />
f<br />
i<br />
2<br />
2<br />
j<br />
∂<br />
∂y<br />
f<br />
2<br />
→ ℜ<br />
3<br />
un<br />
,<br />
k<br />
∂<br />
∂z<br />
f<br />
( u , v)<br />
( u , v)<br />
( u , v)<br />
u(<br />
t)<br />
v(<br />
t)<br />
( u(<br />
t)<br />
, v(<br />
t)<br />
)<br />
( u(<br />
t)<br />
, v(<br />
t)<br />
)<br />
( u(<br />
t)<br />
, v(<br />
t)<br />
)<br />
( Ω(<br />
t)<br />
) Ω′ ( t)<br />
campo vettoriale.<br />
F<br />
3<br />
attraversoS<br />
è :<br />
S è il codominio di<br />
dt<br />
( u, v)<br />
t ∈<br />
t ∈<br />
∈ D<br />
[ a, b]<br />
[ a, b]<br />
+ ∂S<br />
F =<br />
Integrale curvilineo di un campo vettoriale :<br />
INTEGRALI TRIPLI:<br />
Γ<br />
S<br />
rot<br />
( F)<br />
• n dσ<br />
β ( x,<br />
y)<br />
Formula di riduzione: f ( x,<br />
y,<br />
z)<br />
dx dy dz = dx dy f ( x,<br />
y,<br />
z)<br />
D ≡<br />
A ≡<br />
se<br />
f<br />
D A<br />
α ( x, y)<br />
{ ( x, y, z)<br />
: ( x,<br />
y)<br />
∈ A , α(<br />
x, y)<br />
≤ z ≤ β ( x,<br />
y)<br />
} α(<br />
x, y)<br />
, β ( x, y)<br />
{ ( x, y)<br />
: a ≤ x ≤ b , p(<br />
x)<br />
≤ y ≤ q(<br />
x)<br />
}<br />
( x, y, z)<br />
è continua in D allora :<br />
p(<br />
x)<br />
, q(<br />
x)<br />
continue in [ a, b]<br />
f<br />
β ( x,<br />
y)<br />
( x,<br />
y,<br />
z)<br />
dx dy dz = dx dy f ( x,<br />
y,<br />
z)<br />
D A<br />
α ( x, y)<br />
dz =<br />
Formula generale di cambiamento di variabili:<br />
x<br />
= x<br />
f<br />
( u,<br />
v,<br />
w)<br />
y = y(<br />
u, v, w)<br />
z = z(<br />
u, v, w)<br />
b<br />
a<br />
dx<br />
q<br />
p<br />
( x )<br />
( x )<br />
dy<br />
β ( x,<br />
y)<br />
f<br />
α ( x, y)<br />
( x,<br />
y,<br />
z)<br />
dx dy dz = f ( x(<br />
u,<br />
v,<br />
w)<br />
, y(<br />
u, v, w)<br />
, z(<br />
u, v, w)<br />
)<br />
D D<br />
( x,<br />
y,<br />
z)<br />
∂<br />
⋅<br />
∂<br />
dz =<br />
dz<br />
b<br />
continue in A<br />
( x,<br />
y,<br />
z)<br />
( u,<br />
v,<br />
w)<br />
a<br />
dx<br />
q<br />
p<br />
( x )<br />
( x )<br />
du dv dw<br />
dy<br />
β ( x,<br />
y)<br />
f<br />
α ( x, y)<br />
( x,<br />
y,<br />
z)<br />
dz<br />
7