at.logic.gapt.proofs.resolution
Transforms e.g.
Transforms e.g. a proof of Γ :- Δ, φ ∧ ψ to one of Γ :- Δ, φ without introducing a cut.
Assumes that only contractions and logical axioms operate on (ancestors of) the formula, and that func(φ ∧ ψ) is a proof of φ ∧ ψ :- φ.