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матан Бесов - весь 2012
.pdf![](/html/2706/30/html_HjNDWhSO4U.LHVM/htmlconvd-RtNAHM171x1.jpg)
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Ω
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x [a, b] " ψ(x) f (x, y) dy
ϕ(x)
!!! b ! ψ(x)
f (x, y) dx dy = |
f (x, y) dy dx. |
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ϕ(x) |
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c = min ϕ, |
d = max ψ. |
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[a,b] |
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Ω P = [a, b] × [c, d]
˜ →
f P R
˜ f (x, y) (x, y) Ω f (x, y) =
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! f " Ω
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f (x, y) dx dy, |
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a ϕ(x) |
c α(y) |
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Ω = {x = (x1, . . . , xn) = (x , xn) : x E, ϕ(x ) xn ψ(x )},
E Rn−1
ϕ ψ % % E % !
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f
Oxn Ω
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f (x) dx = |
f (x , xn) dxn dx . |
Ω |
E ϕ(x ) |
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x = x(u, v), |
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&◦ J(u, v) |
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E
(u1, v1) (u2, v2) E G
max max 2|xu|, |xv |, |yu|, |yv |3 κ.
E
|F(u2, v2) − F(u1, v1)| 2κ|(u2, v2) − (u1, v1)| =
= 2κ (u2 − u1)2 + (v2 − v1)2. $
( ) ' * ) (xi, yi) = F(ui, vi)+ i = = 1, 2' , - .
! . |
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− u1), v1 + t(v2 |
− v1))|t1=0 | = |
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E R2 \ G
ε > 0 Bε = %m Pk
1
Pk! Bε E μBε < ε " P
(a, b) × (c, d) P [a, b] × [c, d]
12 (b − a) d − c 2(b − a).
# Bε = %m1 Pk
Pk diam Pk ρ $
% Pk
ρ
E! &
Bε Uρ(E) G.
κ = max max {|xu|, |xv|, |yu|, |yv |}
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' (! Pk % ) %
hk √
! Rk % 2 5κhk
F(Pk) Rk, μRk 20κ2μPk.
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μ F(E) μ 0 Rk |
μRk 20κ2 |
μPk = |
k=1 |
k=1 |
k=1 |
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= 20κ2μBε < 20κ2ε. |
& ε > 0
μF(E) = μ F(E) = 0.
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% 1◦ 3◦
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(u0, v0) G h0 > 0
G Qh
{(u, v) : uh u uh + h, vh v vh + h} (u0, v0)
h (0, h0] |
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μF(Qh) |
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h→0+0 |
μQh |
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1 § ./ 0 . n
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5 1 $ |
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y = y0 |
+ a21(u − u0) + a22(v − v0)+ |
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+ ε2(u − u0, v − v0) (u − u0)2 + (v − v0)2, |
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a11 = xu(u0, v0) a12 = xv (u0, v0) a21 = yu(u0, v0) a22 = = yv (u0, v0) εi(u − u0, v − v0) → 0 (u, v) → (u0, v0)
+ F % |
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a11 |
a12 |
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a22 | = |J(u0, v0)|. |
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μQ |
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F(Qh) |
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ε(h) |
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|u−u0| h, |
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|x(u, v) − xˆ(u, v)| ε(h) 2h, |y(u, v) − yˆ(u, v)| |
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! " # " $ " # |
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◦ f G %◦ f (F)J G
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Q = {(u, v)5 u1 u u1 + h" v1 |
v v1 + h} G |
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(1 + ε0) !! f (x(u, v), y(u, v)) |J(u, v)| du dv |
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!! |
Q(k) |
f (x, y) dx dy. |
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F(Q(k))
Q(1)
k = 1 !" Q(1)
Q(2) # $ # # k = = 2 % #
{Q(k)}∞
1 &
' ' # #( #
) Q(k) (u0, v0) Q(k)
k N * # $
(1 + ε0)f (x(¯uk, v¯k), y(¯uk, v¯k))|J(¯uk, v¯k)|μQ(k)
f (˜xk, y˜k)μF(Q(k))
(˜xk, y˜k) F(Q(k)) (¯uk, v¯k) Q(k)
+) # μF(Q(k)) !( ', k → ∞
(1 + ε0)[f (x0, y0) + o(1)][|J(u0, v0)| + o(1)]
[f (x0, y0) + o(1)] [|J(u0, v0)| + o(1)] ,
f > 0 |J| > 0 -
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.- / $ % ! A 0
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f (x(u, v), y(u, v))|J(u, v)| du dv
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dist(F−1(A ), R2u,v \ G) = ρ > 0.
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a |
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