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m = 1, . . . , n (a
α
, b
a
) = 0 α = 1, . . . m
b = 1, . . . , n − m
G (a
1
, . . . , a
m
, b
1
, . . . , b
n−m
) =
G (a
1
, . . . , a
m
) 0
0 G (b
1
, . . . , b
n−m
)
!
,
m
M
1
r
1
m π
m
r = r
0
+ t
α
a
α
M
1
π
m
(m + 1) P (a
1
, . . . , a
m
, r
1
−
r
0
) m P (a
1
, . . . , a
m
)
dist (M
1
, π
m
) =
p
det G (a
1
, . . . , a
m
, r
1
− r
0
)
p
det G (a
1
, . . . , a
m
)
.
det G (a
1
, . . . , a
m
, r
1
−r
0
)
M
0
(r
0
) M
0
0
(r
0
0
) ∈ π
m
r
0
0
= r
0
+ λ
α
a
α
(r
1
− r
0
0
) ⊥ L{a
1
, . . . , a
m
}
λ
α
(r
0
, a
β
) + (λ
α
a
α
, a
β
) = 0, β = 1, . . . , m.
a
α
α = 1, . . . , m
E
n
E
n
∼
=
E
∗
n
x 7→
e
x
e
x(y) = (x, y)
E
n
ε(x
1
, . . . , x
n
) n − 1 x
1
=
a
1
, . . . , x
n−1
= a
n−1
x
n
= x
e
b(x) = ε(a
1
, . . . , a
n−1
, x)
e
b ∈ E
∗
n
b ∈ E
n
eε : E
n
× E
n
× . . . × E
n
|
{z }
n−1
3 {a
1
, . . . , a
n−1
} 7→ b ∈ E
n
,
£¤Y[¥^ -/.-6>E2*:/8 -3:26- ±º 1-7-358 /.35B*D60B5 .30
6+-: m = 1, . . . , n < E 7-9- )7- (aα, ba) = 0 D68 B/*C α = 1, . . . m 0 B/*C
)
b = 1, . . . , n − m .-62 5*:
!
G (a1 , . . . , am ) 0
G (a1 , . . . , am , b1 , . . . , bn−m ) = ,
0 G (b1 , . . . , bn−m )
-712D5 0 /6*D2*7 3*E26>757<
åXæ[ Z[® «][Y\]® X®\]® «] Z m¯W[]^
2/7> E5D5,A 7-)15 M1 / 35D02/ B*17-3-: r1 0 m .6-/1-/7> πm 0:*
58 .535:*730)*/10* 235B,*,08 r = r0 + tαaα < 5//7-8,0* -7 M1 D- πm ,5
C-D07/8 151 4BA/-75; (m + 1) :*3,-9- .53566*6*.0.*D5 P (a1, . . . , am, r1 −
r0 ) -/,-B5,0*: 1-7-3-9- 8B68*7/8 m :*3,A .53566*6*.0.*D P (a1 , . . . , am ) ~
p
det G (a1 , . . . , am , r1 − r0 )
dist (M1 , πm ) = p .
det G (a1 , . . . , am )
*/7B07*6>,- -.3*D*607*6> det G (a1, . . . , am, r1 − r0) ,* 0E:*,07/8 */60
E5:*,07> 7-)12 M0(r0) ,5 M00 (r00) ∈ πm / 35D02/ B*17-3-: r00 = r0 + λαaα
7512 )7- (r1 − r00) ⊥ L{a1, . . . , am} < -¨0½0*,7A λα ,5C-D87/8 0E /0
/7*:A 235B,*,0
(r0 , aβ ) + (λα aα , aβ ) = 0, β = 1, . . . , m. ±»
-/1-6>12 :5730½5 /0/7*:A 235B,*,0 ±» F ¨7- :5730½5 35:5 60,*,-
,*E5B0/0:-9- ,5+-35 B*17-3-B aα α = 1, . . . , m ¨75 /0/7*:5 0:**7 *D0,
/7B*,,-* 3**,0* <
ÅYX\Y WX]¤YZY\]Y E ^
)
5,-,0 */10 0E-:-3 0E: En ∼
n
= E∗n x 7→ x e(y) = (x, y) .-EB-68
e 9D* x
*7 -.3*D*607> 5,56-9 B*17-3,-9- .3-0EB*D*,08 B En <
Á01/0328 B -3:* -+Ö*:5 ε(x , . . . , x ) .*3BA* n − 1 5392:*,7-B x =
a1 , . . . , xn−1 = an−1 5 .-/6*D,0 -/75B688
1 n
.3-0EB-6>,A: xn = x .-62 )
1
0:
60,*,2 -3:2 b(x) e Á
= ε(a1 , . . . , an−1 , x) < -3:* b e ∈ E∗ B 15,-,0)*/1-:
0E-:-30E:* /--7B*7/7B2*7 B*17-3 b ∈ En < 3*E26>757* .-62)5*: -7-+35
n
*,0*
× . . . × En} 3 {a1 , . . . , an−1 } 7→ b ∈ En ,
εe : |En × En {z
n−1
´À
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