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Symbols Language J Metalanguage of J
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abbreviation answers in Belnap's answers to questions Aqvist arbitrary question Belnap Belnap's sense binary relations called category Ey characterized compound questions declarative sentence defined deserve the name direct answers discussed easily verified elements equipollent erotetic exists extensionality and intensionality formalized language former sections formula given question individual constants individual name infinite intensionality interrogative operators interrogative sentence Jan Kowalski Kubinski locution logic of answers logic of questions logical consequence logical product logical sum logical theory logical value logically equivalent mean metalinguistic metatheorem non-empty notion of direct notion of thesis notions of answer numerical operators obtained occur partial answer predicate presuppositions of questions PT\Q ques question expressed question Q questions beginning Reader regular consequence scheme second sense sentence-forming sentential calculus sentential function sentential function 0zi sequence set P)0 set Q(J Stahl subset syntactic presupposition tautologies theorems theory of questions tions two-argument types of questions whereas Wroclaw zi0zi