A formula is upward absolute when its truth in a smaller transitive class implies its truth in a larger one. Existential formulas with bounded matrices are upward absolute because their witnesses remain available.

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  1. Set-theoretic absoluteness
  2. Formula relativization to a class
  3. Transitive class
  4. Class in set theory
  5. Set theory
  6. Foundations of mathematics
  7. Area of mathematics
  8. Mathematics
  9. Home

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