Results about logics that were new with proof systems other than sequent calculus

[martdowd at aol.com]

 Revantha Ramanayake wrote:
>>> I am interested across all logics and all sorts of proof systems 

Adding the extension rule to resolution and Frege systems has had a significant impact in propositional complexity theory.  It has been considered more generally in
   https://link.springer.com/chapter/10.1007/978-3-322-84222-0_4
It undoubtedly can be added to sequent systems.
- Martin Dowd

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