412]
A MEMOIR ON CUBIC SURFACES.
377
29?
- — X + -Y+nZ+W= 0,
m (p — a) m
IX- 21 —Y+ 1 Z+W= 0,
n (p — a) n
7 X + mY- T7~— . 2 + W = 0,
i l(p — a)
. 2m x + mY+ 1^+ TF= 0,
n (p — a) n
1 y_ 2n
l ¿(p-a)
F+ W £+F=0,
IX + -Y r 21 —
m m {p — a)
Z + W =0,
n (p - a) „ 1 „ Trr .
vb 'x + — + nZ+W=0,
2m
m
lX- l -&r-$-Y+ -Z + F = 0,
1 m (p — a) Trr
jX + m\ —’ Z + F = 0,
m(p — a) „ Tr - 1 „ Tr , .
—^ — Z + mF+ - Z + F = 0,
2?l n
\ X - —22— F + ^ = 0.
LY + - 1 r - l<1 l~-)z+ 11'= 0,
2?? i
—+mF+ + (mn (p — a) — 21 (1 — in 2 — n~)) —
p — a x p + (3
11X- 2 —+ IZ +(nl (p-a)-2m(l-n 2 - l 2 )) -^ a
p — a x vr p + /3
mX + IY — ———H (Im (p — a) — 2n (1 — l 2 — m 2 )) a
p — a ' v/ v p + /3
W
+1
F
+,
w
2X 1 1 „ / 1 , . 2 / 1 1 \\
1— 1 H— ^ + ( — (jp — a) — y (1 «— ~^ ))
p — a 11 m \mn l \ m- n 2 ) ]
W
P~ /3
I v , 2Y 1 „ /1 , . 2 / 1 1 \\ F
- A -1 b 7 ^ + ( j(p ~ a ) ( 1 ~ “i - 72)) o
II p — a l \nl xr ' m\ n~ i-J p—(3
2 f
1 1
m^ +1 ^ p — a"*"(k^ w /' 2 m 2 ))p — /3
W
C. VI.
[56' = 1]
[45' = m]
[64'= 11]
[15.26.34=1]
[16.24.35 = m]
[14.25.36 = H]
[65'= 1J
[46' = m 1 ]
[54' = Hj]
[16.25.34=17]
[15.24.36 = ^]
[14.26.35 = 57]
: 0, [51' = p]
0, [35' = q]
0, [13.25.46 = r]
0, [26'=p]
0, [16.23.45 = q]
0, [36' = f ]
48