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P
n
= B(O) A
n+1
O π = A
n
A
n+1
V
n
(π) O π
0
= {O, V
n
(π)}
O π
O π
0
B
π
0
(O) = P
n−1
(π
0
)
(n − 1)
a ∈ B(O)
A
B
O
π
π
0
c
a
b
π
0
π =
A
n
A
a ∈ B(O)\B
π
0
(O)
A = a∩π
h
π
: P
n
\ P
n−1
(π
0
) → A
n
,
P
n
\ P
n−1
(π
0
) ≡ A
n
P
n
= A
n
∪ P
n−1
(π
0
)
π = A
n
P
n−1
(π
0
)
P
n−1
(π
0
) P
n
C ∈ P
n−1
(π
0
) c ∈
B
π
0
(O)
A
n
⊂ P
n
P
n
A
n
A
n
P
n−1
(π)
P
n
= A
n
∪ A
n−1
∪ A
n−2
∪ . . . ∪ A
0
.
Ý^µ Ó]\\® ZY[¥ WXY]\Ú WXX\^ 2/7> Pn = B(O) F /B8E15 .38:AC 50,,-9- .3-/735,/7B5 An+1 / ½*, 73-: B 7-)1* O π = An F 90.*3.6-/1-/7> B An+1 / ,5.35B680: .-D .3-/735,/7B-: Vn(π) ,* .3-C-D858 )*3*E 7-)12 O 5 π0 = {O, Vn(π)} F 90.*3.6-/1-/7> .3-C-D858 )*3*E 7-)12 O 0 .53566*6>,58 π < 38 :A* .3-C-D80* )*3*E O 0 6*50* B 90.*3.6-/1-/70 π0 -+35E27 /B8E12 Bπ (O) = Pn−1 (π 0 ) F (n − 1) :*3,-* .3- *170B,-* .3-/735,/7B- < 0 /60 .38:58 a ∈ B(O) ,* 6*07 B 90 .*3.6-/1-/70 π0 7- -,5 .*3*/*15*7 π = A π ) An B -D,- 7- 1* A < 7,-/8 15D- .38 B :- a ∈ B(O)\Bπ (O) 7-)12 A = a∩π .- 62)0: BE50:,--D,-E,5),-* /--7B*7/7B0* 0 π0 0 Iº O c hπ : Pn \ Pn−1 (π ) → An , a ,5EAB5*:-* j``abbgu vjfigu< b 7-D*/7B688 P \ P (π0) ≡ A .-62)5*: .3*D/75B6*,0* .3-*170B ,-9- .3-/735,/7B5 n n−1 n Pn = An ∪ Pn−1 (π 0 ) I» 151 50,,-9- .3-/735,/7B5 π = An D-.-6,*,,-9- :,-*/7B-: Pn−1(π0) < ³7- :,-*/7B- Pn−1(π0) 8B68*7/8 90.*3.6-/1-/7> B Pn -.3*D*6*,0* 90 .*3.6-/1-/70 B .3-*170B,-: .3-/735,/7B* .30B*D*,- ,0* ,5EAB5*:- |mhvgbmsbg }njombbgu 5 751* bmhg|hikmbbgu 90.*3.6-/1-/7> D68 D5, ,- 50,,- 1537A < /8158 7-)15 C ∈ Pn−1(π0) 7- */7> .38:58 c ∈ ) ) Bπ (O) ,5EAB5*7/8 +*/1-,* ,- 2D56*,,- 060 ,*/-+/7B*,,- 7- 1- 5 0,,-9- .3-/735,/7B5 A ⊂ P < -)10 .3-*170B,-9- .3-/735,/7B5 P 0 .30,5D6*50* An .30 ¨7-: ,5EAB57 /-+/7B*,,A:0 7-)15:0 50,,- n n n 9- .3-/735,/7B5 An < 3*D/75B688 .3-*170B,-* .3-/735,/7B- Pn−1(π) 5 E57*: 0 15D2 B,-B> .-8B682/8 +*/1-,*),- 2D56*,,2 90.*3.6-/1-/7> B B0D* I» .-62 )0: D0EÖ,17,-* -+Ö*D0,*,0* nP =A ∪A n n−1 ∪A n−2 ∪ ... ∪ A . 0 ºH ÎÇ
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