(7)
yk+1 − yk = a (qk+1 + qk) + 2lsk+1.
(8)
Putting
x + yi = w, p + qi = ω, r + si = σ,
(9)
these three pairs of equations may be replaced by the three equations
Aῶk − Kῶki + 2Taῶk − Ta (σk+1 + σk) = 0,
(10)
(7)
yk+1 − yk = a (qk+1 + qk) + 2lsk+1.
(8)
Putting
x + yi = w, p + qi = ω, r + si = σ,
(9)
these three pairs of equations may be replaced by the three equations
Aῶk − Kῶki + 2Taῶk − Ta (σk+1 + σk) = 0,
(10)