
Positive modalities in systems in the vicinity of S4 and S5 are investigated in terms of categorial proof theory. Coherence and maximality results are demonstrated, and connections with mixed distributive laws and Frobenius algebras are exhibited.
43 pages, minor additions
Algebra and Number Theory, FOS: Mathematics, Mathematics - Category Theory, Category Theory (math.CT), Mathematics - Logic, 03B45, 03G30, 18C15, Logic (math.LO)
Algebra and Number Theory, FOS: Mathematics, Mathematics - Category Theory, Category Theory (math.CT), Mathematics - Logic, 03B45, 03G30, 18C15, Logic (math.LO)
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