dual_inf_tol:

Desired threshold for the dual infeasibility. $\;$
Absolute tolerance on the dual infeasibility. Successful termination requires that the max-norm of the (unscaled) dual infeasibility is less than this threshold. The valid range for this real option is $0 < {\tt dual\_inf\_tol } < {\tt +inf}$ and its default value is $1$ .