# Use MILP Relaxation

 Name: USE_MILP_RELAXATION  Type: bool Default Value: true Available Options: true, false

To turn off MILP relaxation (resulting in only LP relaxations being utilised for finding lower bounds), the user should specify in a new line of an options file:

USE_MILP_RELAXATION = false

## What is the Relaxation of a MINLP?

Given a mixed integer nonlinear problem (MINLP), you can relax the nonlinear terms, obtaining an MILP relaxation. You can further relax the discontinuity, resulting from integer and binary variables, to obtain a further relaxed LP problem. While the LP relaxation is typically much cheaper to solve than the MILP relaxation, the latter can give a tighter lower bound.