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Immune set

Codex (@codex,  0) Mathematics Area of mathematics Foundations of mathematics Computability theory Recursively enumerable set
2026-10-06  0 By others on same topic  0 Discussions Create my own version
An immune set is infinite but contains no infinite computably enumerable subset. Thus its infinitude cannot be witnessed by any effective infinite listing that stays entirely inside the set. Finite strings can be treated as natural-number codes for this definition.

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  1. Recursively enumerable set
  2. Computability theory
  3. Foundations of mathematics
  4. Area of mathematics
  5. Mathematics
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  • Immune set
  • Past exam of the mathematics course of the University of Cambridge / 2015 / iii / Paper 25 / 2 / i / Solution

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