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ϕ eϕ
P
n
= V
n+1
\ {0}/∼ ∼
V
n+1
\ {0} v ∼ w ⇐⇒ v = λw
p p : v 7→ [v] [v]
v
RP
n
= R
n+1
\{0}/∼
n
P
n
V
n+1
p p : v 7→ L(v)
P
n
= B(O) (A
n+1
, V
n+1
, ψ)
O ∈ A
n+1
O
p v ∈ V
n+1
\{0} v
O
p : v 7→ `(v) = {M ∈ A
n+1
|r
M
= r
O
+ tv}.
P
n
= S
n
/ ∼ S
n
= {x ∈ E
n
|x
2
= 1} 1
E
n
∼
x ∼ y ⇔ x = ±y p
v ∈ V
n+1
\ {0} x = tv S
n
O
v
`(v)
x
−x
S
n
/{x ∼ −x}
n
ì2D*: 9-B-307> )7- 60,*,-* -7-+35*,0* ϕ egfgynjmi :-30E: ϕe<
Ý^ X]YX WXY]\× WXX\^
< P = V \ {0}/ ∼ 9D* ∼ F -7,-*,0* ¨1B0B56*,7,-/70 ,5 :,-*/7B*
Vn+1 \ {0} -.3*D*68*:-* /6*D20: -+35E-:~ v ∼ w ⇐⇒ v = λw < 7-+
n n+1
35*,0* p 0:**7 B0D p : v 7→ [v] 9D* [v] F 165// B*17-3-B ¨1B0B56*,7,AC
B*17-32 v <
)5/7,-/70 .3-/735,/7B- RP = R \ {0}/ ∼ +2D*: ,5EAB57> hijbp
njfibcd .3-*170B,A: .3-/735,/7B-: n
35E:*3,-/70 n <
n+1
G< Pn F :,-*/7B- -D,-:*3,AC .-D.3-/735,/7B B*17-3,-9- .3-/735,/7
B5 Vn+1 < 7-+35*,0* p 0:**7 B0D p : v 7→ L(v) <
±< P = B(O) F :,-*/7B- .38:AC 50,,-9- .3-/735,/7B5 (A , V , ψ)
.3-C-D80C )*3*E 01/03-B5,,2 7-)12 O ∈ An+1 < 51-* :,-*/7B- .38
n n+1 n+1
:AC ,5EAB5*7/8 hktlvgu 7-)15 O ,5EAB5*7/8 mbifgd /B8E10 < 7-+35*
,0* p -7,-/07 B*17-32 v ∈ Vn+1 \{0} .38:2 / ,5.35B680: B*17-3-: v
.3-C-D82 )*3*E O
p : v 7→ `(v) = {M ∈ An+1 | rM = rO + tv}.
² < P = Sn/ ∼ 9D* Sn = {x ∈ E | x2 = 1} F /*35 35D02/5 1 B *B
160D-B-: .3-/735,/7B* En 5 -7,-*,0* ¨1B0B56*,7,-/70 ∼ -.3*D*6*,-
n n
/6*D20: -+35E-:~ x ∼ y ⇔ x = ±y < 7-+35*,0* p -7,-/07 B*17-32
) )
v ∈ Vn+1 \ {0} .532 7- *1 .*3*/* *,08 .38:- x = tv /- / *3- Sn <
x
`(v)
v
O
−x
B8E15 Sn /{x ∼ −x}
ªY«\]Y^ -/1-6>12 .3-*170B,A* .3-/735,/7B5 -D,- 35E:*3,-/70
0E-:-3,A 7- .30B*D*,,A* BA* .30:*3A ,5EAB57 751* dgnmotda
.3-*170B,-9- .3-/735,/7B5 35E:*3,-/70 n <
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