Erkenntnistheorie; Epistemology; Science (theory of) ; Philosophy of science ; Realism (epistemology) ; Erkenntnistheorie und Semiotik; Epistemology and semiotics; Semiotics and epistemology ; Philosophy of language ; Erkenntnistheorie und Pragmatismus; Epistemology and pragmatism; Pragmatism (epistemology) ; Truth theory