Logic And Foundations Of Mathematics / Modal Logic / Pragmatism / Logic / American Philosophy / Fuzzy Logic / History of Logic / Philosophical Logic / Philosophy of Logic / Logical Consequence / Mathematical Logic / C. I. Lewis / History and Philosophy of Logic / STRICT IMPLICATION / Fuzzy Logic / History of Logic / Philosophical Logic / Philosophy of Logic / Logical Consequence / Mathematical Logic / C. I. Lewis / History and Philosophy of Logic / STRICT IMPLICATION