The phrase "ancillary problem" is correct and usable in written English.
It can be used to refer to a secondary or supplementary issue that is related to a primary problem.
Example: "While addressing the main issue, we also need to consider the ancillary problem that may arise from our proposed solution."
Alternatives: "secondary issue" or "supplementary problem".
(An ancillary problem: the lead dogs on the college-football beat who earn promotions for catching sophomores smoking pot).
Then, tube-based MPC solves two optimal control problems, a standard problem for the nominal system to define a central guide path, and an ancillary problem to steer the state vector towards the central path with semi-optimal control effort.
The controller solves two optimal control problems, one which solves a standard problem for the nominal system to define a central guide path, and an ancillary problem to steer the states towards the central path despite the uncertainties and disturbances.
Now for an ancillary problem attached to Wilson's glitch.
"The question is whether he's created an ancillary problem about his truthfulness and upfrontness," said David Doak, a Democratic strategist, expressing a view shared by some Republicans.
"It is not an ancillary problem that is perhaps going to solve itself, but something that really needs to lead the discussion, at least from the environmental side of things, as we think about future development".
The losses, though, have exacerbated the ancillary problems, placing them under a magnifying glass.
But he's made things a bit worse for himself by trying to take advantage of the crisis to tackle ancillary problems and drive moderates into the other camp.
By solving these ancillary problems, Millennials are more likely to participate, and continue spending on travel, it is argued.
Like Alonso, Button failed to set a time as the McLaren was stranded in the pits with what the team said were "ancillary problems".
While the evolution of surgical techniques forms a major chapter in the book, many ancillary problems are addressed including the control of hemorrhage and infection, the approach to pain relief, the development of suitable instruments and equipment, and the invention of prostheses, all suitably illuminated with case histories and relevant illustrations.
