[Ipopt] Does Ipopt use Reduce Space Interior Point method?

[Ipopt User]

In the implementation paper (
http://cepac.cheme.cmu.edu/pasilectures/biegler/ipopt.pdf ) you can see
that system (9) is reduced to system (11), so IPOPT does not solve the
fully reduced system (with only the actual variables).

You could try other linear solvers (different from MA57).
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