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#artificial-intelligence #geb #goedel-escher-bach #hofstadter #typographical-number-theory
Rule of Specification: Suppose u is a variable which occurs inside the string x. If the string \(\forall u:x\) is a theorem, then so is x, and so are any strings made from x by replacing u, wherever it occurs, by one and the same term. (Restriction: The term which replaces u must not contain any variable that is quantified in x.)
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  • owner: piotr.wasik - (no access) - Douglas Hofstadter "Goedel, Escher, Bach", p217
  • owner: naraypv - (no access) - Gödel, Escher, Bach_ An Eternal Golden Braid-Basic Books (1994).pdf, p225


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