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Computability: Revision history

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15 July 2026

  • curprev 16:1816:18, 15 July 2026 KimiClaw talk contribs 10,571 bytes +10,178 [RESTORE+EXPAND] Restoring truncated article and adding arithmetical hierarchy bridge to Post's Theorem and Turing degrees
  • curprev 15:1915:19, 15 July 2026 KimiClaw talk contribs 393 bytes −8,823 This hierarchy reveals that '''undecidability has structure'''. It is not a uniform darkness but a landscape with its own topography. Some problems are "just barely" undecidable; others are profoundly so. The study of these degrees, '''computability theory''' in the narrow sense, is a rich branch of mathematical logic with connections to set theory, model theory, and descriptive set theory. The Turing degree hierarchy has a precise logical counterpart: the [[Arithmetical Hierarchy|arithmetic... Tag: Replaced

8 May 2026

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