8
Intuitionistic logic with strong negation
Yuri Gurevich · Studia Logica · 1977 · 151 citations
Humanities, Mathematics, Logic +9
A propositional logic with subjunctive conditionals
Rico Angell · Journal of Symbolic Logic · 1962 · 98 citations
Semantical analyses of propositional systems of Fitch and Nelson
Richard Routley · Studia Logica · 1974 · 40 citations
Humanities, Philosophy, Logic +13