Removing bounds
To remove a bound in the Interactive Optimizer, use the set command.
To remove a bound, set it to +∞ or –∞.
Interactively, use the identifiers inf and -inf instead
of the symbols. To change the upper bound of x2 back
to +∞, use the one line command:
change bounds x2 u inf
You receive the message:
New bounds on variable 'x2': The indicated variable is >= 0.
The bound is now the same as it was when the problem was originally entered.