ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  frecsuclem2 GIF version

Theorem frecsuclem2 6020
Description: Lemma for frecsuc 6022. (Contributed by Jim Kingdon, 15-Aug-2019.)
Hypothesis
Ref Expression
frecsuclem1.h 𝐺 = (𝑔 ∈ V ↦ {𝑥 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑥 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑥𝐴))})
Assertion
Ref Expression
frecsuclem2 ((∀𝑧(𝐹𝑧) ∈ V ∧ 𝐴𝑉𝐵 ∈ ω) → ((recs(𝐺) ↾ suc 𝐵)‘𝐵) = (frec(𝐹, 𝐴)‘𝐵))
Distinct variable groups:   𝐴,𝑔,𝑚,𝑥,𝑧   𝐵,𝑔,𝑚,𝑥,𝑧   𝑔,𝐹,𝑚,𝑥,𝑧   𝑔,𝐺,𝑚,𝑥,𝑧   𝑔,𝑉,𝑚,𝑥
Allowed substitution hint:   𝑉(𝑧)

Proof of Theorem frecsuclem2
StepHypRef Expression
1 sucidg 4181 . . . 4 (𝐵 ∈ ω → 𝐵 ∈ suc 𝐵)
2 fvres 5226 . . . 4 (𝐵 ∈ suc 𝐵 → ((recs(𝐺) ↾ suc 𝐵)‘𝐵) = (recs(𝐺)‘𝐵))
31, 2syl 14 . . 3 (𝐵 ∈ ω → ((recs(𝐺) ↾ suc 𝐵)‘𝐵) = (recs(𝐺)‘𝐵))
4 df-frec 6009 . . . . . 6 frec(𝐹, 𝐴) = (recs((𝑔 ∈ V ↦ {𝑥 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑥 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑥𝐴))})) ↾ ω)
5 frecsuclem1.h . . . . . . . 8 𝐺 = (𝑔 ∈ V ↦ {𝑥 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑥 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑥𝐴))})
6 recseq 5952 . . . . . . . 8 (𝐺 = (𝑔 ∈ V ↦ {𝑥 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑥 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑥𝐴))}) → recs(𝐺) = recs((𝑔 ∈ V ↦ {𝑥 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑥 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑥𝐴))})))
75, 6ax-mp 7 . . . . . . 7 recs(𝐺) = recs((𝑔 ∈ V ↦ {𝑥 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑥 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑥𝐴))}))
87reseq1i 4636 . . . . . 6 (recs(𝐺) ↾ ω) = (recs((𝑔 ∈ V ↦ {𝑥 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑥 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑥𝐴))})) ↾ ω)
94, 8eqtr4i 2079 . . . . 5 frec(𝐹, 𝐴) = (recs(𝐺) ↾ ω)
109fveq1i 5207 . . . 4 (frec(𝐹, 𝐴)‘𝐵) = ((recs(𝐺) ↾ ω)‘𝐵)
11 fvres 5226 . . . 4 (𝐵 ∈ ω → ((recs(𝐺) ↾ ω)‘𝐵) = (recs(𝐺)‘𝐵))
1210, 11syl5eq 2100 . . 3 (𝐵 ∈ ω → (frec(𝐹, 𝐴)‘𝐵) = (recs(𝐺)‘𝐵))
133, 12eqtr4d 2091 . 2 (𝐵 ∈ ω → ((recs(𝐺) ↾ suc 𝐵)‘𝐵) = (frec(𝐹, 𝐴)‘𝐵))
14133ad2ant3 938 1 ((∀𝑧(𝐹𝑧) ∈ V ∧ 𝐴𝑉𝐵 ∈ ω) → ((recs(𝐺) ↾ suc 𝐵)‘𝐵) = (frec(𝐹, 𝐴)‘𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 101  wo 639  w3a 896  wal 1257   = wceq 1259  wcel 1409  {cab 2042  wrex 2324  Vcvv 2574  c0 3252  cmpt 3846  suc csuc 4130  ωcom 4341  dom cdm 4373  cres 4375  cfv 4930  recscrecs 5950  freccfrec 6008
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105  ax-io 640  ax-5 1352  ax-7 1353  ax-gen 1354  ax-ie1 1398  ax-ie2 1399  ax-8 1411  ax-10 1412  ax-11 1413  ax-i12 1414  ax-bndl 1415  ax-4 1416  ax-14 1421  ax-17 1435  ax-i9 1439  ax-ial 1443  ax-i5r 1444  ax-ext 2038  ax-sep 3903  ax-pow 3955  ax-pr 3972
This theorem depends on definitions:  df-bi 114  df-3an 898  df-tru 1262  df-nf 1366  df-sb 1662  df-clab 2043  df-cleq 2049  df-clel 2052  df-nfc 2183  df-ral 2328  df-rex 2329  df-v 2576  df-un 2950  df-in 2952  df-ss 2959  df-pw 3389  df-sn 3409  df-pr 3410  df-op 3412  df-uni 3609  df-br 3793  df-opab 3847  df-suc 4136  df-xp 4379  df-res 4385  df-iota 4895  df-fv 4938  df-recs 5951  df-frec 6009
This theorem is referenced by:  frecsuclem3  6021
  Copyright terms: Public domain W3C validator