Logical connectives for constructive modal logic
Model-theoretic proofs of functional completeness along the lines of [\textit{D. P. McCullough}, J. Symb. Log. 36, 15--20 (1971; Zbl 0216.28801)] are given for various constructive modal propositional logics with strong negation.
scientific article; zbMATH DE number 5080777
scientific article