Undecidable indirectly reflexive sentences
A generalization ofthe well-known diagonalization (reflexion) lemma for the case of indirect reflexion is proved forthe theory of formal arithmetic. Indirectly reflexive sentences about provability and refutability inthe º-consistent theory of formal arithmetic are studied. Existence of undecidable sentencesamong some sets of indirectly reflective sentences is proved. If provability and refutability are replacedby truth and falsehood, existence of undecidable sentences leads to paradoxes.
Keywords
paradoxes, undecidable sentences, indirect reflexion, diagonalization, formal arithmetic, парадоксы, неразрешимые предложения, косвенная рефлексия, диагонализация, формальная арифметикаAuthors
Name | Organization | |
Zyuzkov V.M. | vmz@math.tsu.ru |
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