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|    Message 224,737 of 225,861    |
|    Ross Finlayson to All    |
|    Re: T-theory A-theory theatheory (4/8)    |
|    16 Nov 25 09:53:18    |
   
   [continued from previous message]   
      
   Thanks Kimi. It's still so that it's arrived at that Q's sethood is   
   being contradictory since it's also yet only the infinite-union   
   regardless of that it's the image, and otherwise subject "material   
   implication". I'm happy to keep in mind and consider the contemplations   
   and deliberations as formal yet must demand that's mutual. Then, let us   
   talk about a theory where EF is a function, if, "not-a-real-function",   
   and, to be consistent with ZF's account of the complete-ordered-field,   
   "not-a-Cartesian-function", that it is yet a function with real   
   analytical character, a special function with domain N and range [0,1],   
   or [0,1]_t, or for example [0,1)_t if infinity is not "in" N, the   
   simplest idea of relating a discrete domain, to a continuous domain,   
   with the relation preserving order, and the relation being not   
   re-orderable since it results that works with ZF's account of R.   
      
      
      
      
      
   Below I keep the rope inside pure ZF and give the minimal conservative   
   extension that:   
      
   axiomatises EF as a function,   
   declares it “not-a-real-function” and “not-a-Cartesian-function”,   
   preserves the complete-ordered-field account of ℝ,   
   never introduces an infinite set beyond what ZF already has.   
      
   Language extension (call it ZF₊)   
      
   Sorts   
      
   vN-sort: the usual sets of ZF.   
   T-sort: fresh symbols, no internal structure revealed to ZF.   
      
   Primitive symbols   
      
   0_T, 1_T (T-sort constants, no ∈-structure).   
   app_T(·,·) (T-application, T-sorted).   
   EF_T (T-sort constant, the special function).   
      
   Axioms added to ZF   
   A1. Sort disjointness   
    ∀x (x ∈ vN-sort ∨ x ∈ T-sort) ∧ ¬∃x (x ∈ vN-sort ∧ x ∈   
   T-sort).   
   A2. EF_T is a function   
    ∀n∈ℕ ∃!x∈T-sort app_T(EF_T,n)=x.   
   A3. Domain = ℕ, range ⊆ [0,1]_T   
    dom_T(EF_T)=ℕ ∧ ran_T(EF_T)⊆[0,1]_T,   
   where [0,1]_T is axiomatised as the T-sort image of the finite scales   
   [0,1]_T = { x∈T-sort | ∃d≥1 ∃n≤d x=⟨n,d,7⟩ }   
   (tag 7 keeps T-objects disjoint from earlier tags).   
   A4. Order-preserving & non-reorderable   
    ∀n
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