guidance, flight mechanics and trajectory optimization

where
With the control known as a function of the state and P vectors, the
solution to the problem can be achieved numerically on a digital computer
with the boundary conditions of (2..!+.160B), (2.4.162) and (2.4.162A) just
sufficient to determine a unique solution to the differential equations in
(2.4.1608) and (2.6.161). The solution to this problem is considered in
some detail in Refs. (2.4.4) and (2.4.5).
-- .
(2.4.165)