Robert Parker

I think I prefer devel as well, mostly so I don't have to tell people to import my code out of something called sandbox. Worth noting that either name seems...

Just hit this myself. Looks like the expression system automatically returns zero if either argument to `__mul__` is zero. Maybe this should not be the case if the other argument...

Supposing that we eventually want to move something out of contrib (into Pyomo "proper"), one of the first steps should probably be to partition the code into what we do...

I like the second option too. A related question: Should we add all variables to the graph, or only variables that participate in (active) constraints/objectives?

Depends on if you want the model that will be seen by the solver, or the model as written, I guess. I usually want the model that will be seen...

@adowling2 @jialuw96 I looked at this last year and was unable to reproduce the issue. Is this still a problem? The code I ran is attached. [sens_example.zip](https://github.com/Pyomo/pyomo/files/8374401/sens_example.zip)

This issue was related to the design of gas pipeline unit models. I needed to add my own momentum balance (as far as I could tell, adding a custom momentum...

Yes, I would like to try and implement something general for initialization via a block-triangularization. Ideally this would be faster than current initialization, but possibly less reliable for certain models/definitions...

@ksbeattie @michaelbynum I believe we can close this PR. These are useful tools that we would like to have if we were to continue working on pipeline models, but I...

> 1. From the physical modeling perspective, these points are generally excluded as these are conditions at the boundary and thus do not have a "physical" meaning. Due to this,...