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m
∗
b
= −(AC, B
∗
) =
2t
2
2t
2
+ 1
, m
∗
c
= −(AB, C
∗
) =
2t
2
2t
2
+ 1
.
˜a B C
a
ch
˜a
ρ
=
2t
2
+ 1
2t
2
.
hpp(II)
ˆ
H ρ ρ ∈
R
+
hpp(II)
ABC hpp(II) m
∗
b
(m
∗
b
= −(AC, B
∗
)) m
∗
c
(m
∗
c
= −(AB, C
∗
))
m
∗
b
= m
∗
c
,
ch
˜a
ρ
m
∗
b
= −1.
hpp(II)
ABC 20
a R
epp(I)
ABC
E
A AB AC (BE
13
A
1
A) = t > 0 E
13
= A
2
E ∩ AA
1
(t : t : −1)
a 4t
2
− 1 < 0 t ∈ (0; 1/2)
A
∗
(1 : −1 : 0) a
A ˜a
S
b
S
c
ABC
hpp(II)
ABC
˜a B C
a t ∈ (0; 1/2)
ch
˜a
ρ
=
1 − 2t
2
2t
2
.
