This solution, however, raises other issues, including the political one of leaving no army in Rome itself. In general, what constitutes an acceptable answer depends very strongly on the constraints that you impose in defining the problem. Pennies in a tray. The Codemart catalog. ReVelle, C.S., and K.E. Rosing.
Comments are welcome.
He is the author of The Mathematical Tourist, Islands of Truth, Newton's Clock, Fatal Defect, and The Jungles of Randomness.