deducibility การใช้

• The supposed relationship does not appear to be based on logical deducibility.
• Argument-deduction-proof distinctions are inseparable from what have been called the " consequence-deducibility " distinction and the " truth-and-consequence conception of proof ".
• According to Prawitz ( 1965 ) : " The calculi of sequents can be understood as meta-calculi for the deducibility relation in the corresponding systems of natural deduction . " And furthermore : " A proof in a calculus of sequents can be looked upon as an instruction on how to construct a corresponding natural deduction . " In other words, the assertion symbol is part of the object language for the sequent calculus, which is a kind of meta-calculus, but simultaneously signifies deducibility in an underlying natural deduction system.
• According to Prawitz ( 1965 ) : " The calculi of sequents can be understood as meta-calculi for the deducibility relation in the corresponding systems of natural deduction . " And furthermore : " A proof in a calculus of sequents can be looked upon as an instruction on how to construct a corresponding natural deduction . " In other words, the assertion symbol is part of the object language for the sequent calculus, which is a kind of meta-calculus, but simultaneously signifies deducibility in an underlying natural deduction system.