9
Hi<t> H19'
The line A to B is followed passing through first the bottom-
number in 4, 4 reversing the signs. Coming back from B to A the
signs are reversed again to the original ones.
The row H8-^ starts at B to A passing through first the top-
number in 4, 4, the signs being kept as they were originally, then
backwards from A to B with the opposite sign via the bottom-
number in 4, 4.
The values on the diagonals are given in their sequence from
P to Q (scheme 9) in a table. This table can be extended ad libitum
as there are certain relations between these cofactors, e.g.
ffi. 1 IP-3 —Gpn £1- Z.1. p Gpo.1.3. a L*. p 2Gx2
2 =^i> 2 (see III, B)
likewise: H2-2Hi-i G1,3 etc.
Further: A..HG 1 A, 1 .H1>1=l~Ai
11 1 L i~l 1
in which H\>1 is H1'1 in a chain of i triangles.
It was already known, that
AH(ty n i cp) A{i (<p i|/).
The table is: (10), see p. 8.
36,
36
20
29
"20
ZA
26,
Fig. '2
