165 1848-1925 20thcentury 801 beliefanddoubt computers concepts congresses contributionsinconceptofreferencefrege contributionsinconceptofsensefrege description(philosophy) frege functionalism(psychology) gottlob history identity(philosophicalconcept) languageandlanguages literatur literature mathematics meaning(philosophy) mind-brainidentitytheory names necessity(philosophy) onomasiology philosophie philosophy philosophyofmind proposition(logic) realism reference(linguistics) referenz<linguistik> reflection(philosophy) representation(philosophy) self-knowledge semantics(philosophy) semioticsandliterature sense(philosophy) theoryof thoughtandthinking truth