1724-1804 1781-1848 1845-1918 1859-1938 1872-1970 1889-1951 1903-1930 192 193 20thcentury 700=aacr2 algebraicfunctions algebraiclogic analysis(philosophy) aristotle arithmetic benno bernard bertrand cantor congresses contributionsinconceptofreferencefrege contributionsinconceptofsensefrege contributionsinsemanticsbolzano contributionsinsemanticsfrege contributionsinsemanticskant edmund filosofiadalinguagem foundations frankplumpton frege georg gottlob history husserl immanuel kant kerry languageandlanguages logic ludwig mathematics mathematicsfrege meaning(philosophy) numberconcept object(philosophy) phenomenology philosophy philosophyandscience proposities ramsey reference(philosophy) russell semantics semantics(philosophy) sense(philosophy) silence(philosophy) symbolicandmathematical symbolicandmathematicallogic truthfulnessandfalsehood viennacircle wittgenstein