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Theorem bnj60 31256
Description: Well-founded recursion, part 1 of 3. The proof has been taken from Chapter 4 of Don Monk's notes on Set Theory. See http://euclid.colorado.edu/~monkd/setth.pdf. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)
Hypotheses
Ref Expression
bnj60.1 𝐵 = {𝑑 ∣ (𝑑𝐴 ∧ ∀𝑥𝑑 pred(𝑥, 𝐴, 𝑅) ⊆ 𝑑)}
bnj60.2 𝑌 = ⟨𝑥, (𝑓 ↾ pred(𝑥, 𝐴, 𝑅))⟩
bnj60.3 𝐶 = {𝑓 ∣ ∃𝑑𝐵 (𝑓 Fn 𝑑 ∧ ∀𝑥𝑑 (𝑓𝑥) = (𝐺𝑌))}
bnj60.4 𝐹 = 𝐶
Assertion
Ref Expression
bnj60 (𝑅 FrSe 𝐴𝐹 Fn 𝐴)
Distinct variable groups:   𝐴,𝑑,𝑓,𝑥   𝐵,𝑓   𝐺,𝑑,𝑓,𝑥   𝑅,𝑑,𝑓,𝑥
Allowed substitution hints:   𝐵(𝑥,𝑑)   𝐶(𝑥,𝑓,𝑑)   𝐹(𝑥,𝑓,𝑑)   𝑌(𝑥,𝑓,𝑑)

Proof of Theorem bnj60
Dummy variables 𝑔 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 bnj60.1 . . . . 5 𝐵 = {𝑑 ∣ (𝑑𝐴 ∧ ∀𝑥𝑑 pred(𝑥, 𝐴, 𝑅) ⊆ 𝑑)}
2 bnj60.2 . . . . 5 𝑌 = ⟨𝑥, (𝑓 ↾ pred(𝑥, 𝐴, 𝑅))⟩
3 bnj60.3 . . . . 5 𝐶 = {𝑓 ∣ ∃𝑑𝐵 (𝑓 Fn 𝑑 ∧ ∀𝑥𝑑 (𝑓𝑥) = (𝐺𝑌))}
41, 2, 3bnj1497 31254 . . . 4 𝑔𝐶 Fun 𝑔
5 eqid 2651 . . . . . . . 8 (dom 𝑔 ∩ dom ) = (dom 𝑔 ∩ dom )
61, 2, 3, 5bnj1311 31218 . . . . . . 7 ((𝑅 FrSe 𝐴𝑔𝐶𝐶) → (𝑔 ↾ (dom 𝑔 ∩ dom )) = ( ↾ (dom 𝑔 ∩ dom )))
763expia 1286 . . . . . 6 ((𝑅 FrSe 𝐴𝑔𝐶) → (𝐶 → (𝑔 ↾ (dom 𝑔 ∩ dom )) = ( ↾ (dom 𝑔 ∩ dom ))))
87ralrimiv 2994 . . . . 5 ((𝑅 FrSe 𝐴𝑔𝐶) → ∀𝐶 (𝑔 ↾ (dom 𝑔 ∩ dom )) = ( ↾ (dom 𝑔 ∩ dom )))
98ralrimiva 2995 . . . 4 (𝑅 FrSe 𝐴 → ∀𝑔𝐶𝐶 (𝑔 ↾ (dom 𝑔 ∩ dom )) = ( ↾ (dom 𝑔 ∩ dom )))
10 biid 251 . . . . 5 (∀𝑔𝐶 Fun 𝑔 ↔ ∀𝑔𝐶 Fun 𝑔)
11 biid 251 . . . . 5 ((∀𝑔𝐶 Fun 𝑔 ∧ ∀𝑔𝐶𝐶 (𝑔 ↾ (dom 𝑔 ∩ dom )) = ( ↾ (dom 𝑔 ∩ dom ))) ↔ (∀𝑔𝐶 Fun 𝑔 ∧ ∀𝑔𝐶𝐶 (𝑔 ↾ (dom 𝑔 ∩ dom )) = ( ↾ (dom 𝑔 ∩ dom ))))
1210, 5, 11bnj1383 31028 . . . 4 ((∀𝑔𝐶 Fun 𝑔 ∧ ∀𝑔𝐶𝐶 (𝑔 ↾ (dom 𝑔 ∩ dom )) = ( ↾ (dom 𝑔 ∩ dom ))) → Fun 𝐶)
134, 9, 12sylancr 696 . . 3 (𝑅 FrSe 𝐴 → Fun 𝐶)
14 bnj60.4 . . . 4 𝐹 = 𝐶
1514funeqi 5947 . . 3 (Fun 𝐹 ↔ Fun 𝐶)
1613, 15sylibr 224 . 2 (𝑅 FrSe 𝐴 → Fun 𝐹)
171, 2, 3, 14bnj1498 31255 . 2 (𝑅 FrSe 𝐴 → dom 𝐹 = 𝐴)
1816, 17bnj1422 31034 1 (𝑅 FrSe 𝐴𝐹 Fn 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 383   = wceq 1523  wcel 2030  {cab 2637  wral 2941  wrex 2942  cin 3606  wss 3607  cop 4216   cuni 4468  dom cdm 5143  cres 5145  Fun wfun 5920   Fn wfn 5921  cfv 5926   predc-bnj14 30882   FrSe w-bnj15 30886
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991  ax-reg 8538  ax-inf2 8576
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-fal 1529  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-om 7108  df-1o 7605  df-bnj17 30881  df-bnj14 30883  df-bnj13 30885  df-bnj15 30887  df-bnj18 30889  df-bnj19 30891
This theorem is referenced by:  bnj1501  31261  bnj1523  31265
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