Presents sequent system GL₊^{⊤⊥} such that φ ⊢ ψ is provable iff φ ⊃ ψ is provable in GL for positive modal formulas.
Kripke completeness of strictly positive modal logics over meet-semilattices with operators
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A proof system for the positive fragment of GL
Presents sequent system GL₊^{⊤⊥} such that φ ⊢ ψ is provable iff φ ⊃ ψ is provable in GL for positive modal formulas.