210
ON THE RATIONAL TRANSFORMATION BETWEEN TWO SPACES.
[447
45. It is to be remarked upon the tables—first, as regards the lines: if we add
the numbers in each line, reckoning m p as mp, (that is, each multiple point, according
to "the number of branches through it,) the sums for the successive lines are
2, 5, 8, 11, 14, &c.; that is, each line passes through 2 points, each conic through
5 points, each cubic through 8 points, each quartic through 11 points, &c. But if we
add the numbers reckoning mP as m.^p(p + 1), (that is, each multiple point according
to its effect in the determination of the curve,) then the sums are 2, 5, 9, 14, 20, &c.,
that is, all the curves are completely determined, viz., the line by 2 conditions, the
conic by 5 conditions, the cubic by 9 conditions, &c. Secondly, as regards the columns,
if for any column, reckoning m p as mp, we multiply each number by the corresponding
outside left-hand number, add, and divide the sum by the outside number at the head
of the column, the successive results are 2, 5, 8, 11, 14, &c.; this merely expresses the
known circumstance that the Jacobian passes 3r — 1 times through each point c^.
46. The analogous tables showing the passage of the Jacobian through the
principal system, in the solutions belonging to certain special forms of n, are
Table n=p.
“i
a p-1
II
II
2p-2
1
af = 2p — 2
1
1
a p-1— 1
2p — 2
p-2
Tables n = 2p.
«1
II
3
«2
II
2p-2
1
II
0
a P
II
0
a 2p-
II
1
2
«1
II
2p — 2
a 2
II
0
a p-l
II
1
a p
II
3
a 2p-2
II
0
af = 2p - 2
1
1
af = 3
2
a.; = 0
a/ =.2p-2
1
1
3
a 'p-1 = 1
2p-2
\P~ 2
O-'p-1 = 0
<
II
05
2
2p — 2
Ji)- 1
a p = 0
a 2p~2 — 9
a 2p~2 = 1
2p — 2
p-2
3^-1