Alma Walmsley

## Fixes # . ## Summary/Motivation: Trying to run the `couenne` solver executable through Pyomo throws an error. Pyomo tries to check the version of the executable specified to verify...

NL writer: Add custom exception for no free variables

12

## Fixes https://github.com/Pyomo/pyomo/issues/3411. ## Summary/Motivation: `nl_writer.py` raises a `ValueError` for when no free variables are found when writing the `nl` file. However, this is potentially a valid case in my...

## Summary I want to know if there is a way to detect that all variables in the model have been fixed (and therefore solving can be skipped). Currently the...