Kurs_vysshei_matematiki_UP_Berkov_N.A._2007-2
.pdfu N IZOL
xm, ym
U = 1000C
q = −60/2
U = 200C
α = 10/(2K) K = 15/(K)
CG AE
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15 |
uN1m − uN1−1m |
= 10(u |
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20) |
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hx |
N1m − |
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uN1m = |
3uN1−1m − 40hx |
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(m = 0, 1, . . . , M 2); (EH); |
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3 + 2hx |
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15 |
unM2+1 − unM2 |
= 10(u |
20) |
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hy |
nM2 − |
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u |
2 |
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3unM2+1 + 40hy |
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(n = N 1 + 1, . . . , N ); (EF ). |
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nM |
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3 + 2hy |
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1000C (DC) (AD)
Rn
Rn
Rn
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Rn |
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i = 1, . . . , n} |
n |
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xi R, |
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Rn = {x = (x1, . . . , xn) : |
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Rn |
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x = (x1, . . . , xn), x = (x |
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x1 |
+ x |
= |
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= (x1 + x1, . . . , xn + xn) |
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1 |
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n |
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1 |
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λx ) |
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0 = (0, . . . , 0) |
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x = (x1, . . . , xn), |
λ |
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R |
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λx |
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= (λx1, . . . , |
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n n |
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R |
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Rn |
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x = (x , . . . , x ), |
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x = (x |
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1 |
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n |
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1 |
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n |
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ρ(x, x ) = n (xi − xi)2 1/2 .
i=1
|x| := |
xi2 |
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n |
1/2 |
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i |
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=1 |
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ρ(x, x ) = |x − x |
|x| 0 x Rn |x| = 0 x = 0
|αx| = |α| · |x| x Rn α R |x + x | |x| + |x | x x Rn
Rn
x p = |
n |
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|xi|p 1/p |
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(1 p < ∞) |
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i |
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=1 |
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x |
= max x . |
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∞ |
i i n |
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i| |
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ρ(x, x ) = x − x
X X
x : X → R
x 0 x X x = 0 x = 0
αx = |α|x α R, x X
x1 + x2 x1 + x2 x1, x2
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X x 1 |
x 2 |
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X |
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x X |
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C1 |
C2 |
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C1 x 1 x 2 C2 x 1 x X. |
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ρ(x1, x2) = x1 − x2 |
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{xn} |
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X |
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ε > 0 |
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Nε |
ρ(xn , xn ) < ε |
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n > Nε, n > Nε |
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x = (x1, . . . , xn) Rn |
lpn |
i=1 |xi|p |
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, 1 p ∞ |
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x p = |
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C(K, Rn) |
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1/p |
x(t) : K |
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n |
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→ |
Rn |
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K |
x(t) 0 = |
max x(t) |
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→ |
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t K | |
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A A