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Theorem nffrec 6300
Description: Bound-variable hypothesis builder for the finite recursive definition generator. (Contributed by Jim Kingdon, 30-May-2020.)
Hypotheses
Ref Expression
nffrec.1 𝑥𝐹
nffrec.2 𝑥𝐴
Assertion
Ref Expression
nffrec 𝑥frec(𝐹, 𝐴)

Proof of Theorem nffrec
Dummy variables 𝑔 𝑚 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-frec 6295 . 2 frec(𝐹, 𝐴) = (recs((𝑔 ∈ V ↦ {𝑦 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑦 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑦𝐴))})) ↾ ω)
2 nfcv 2282 . . . . 5 𝑥V
3 nfcv 2282 . . . . . . . 8 𝑥ω
4 nfv 1509 . . . . . . . . 9 𝑥dom 𝑔 = suc 𝑚
5 nffrec.1 . . . . . . . . . . 11 𝑥𝐹
6 nfcv 2282 . . . . . . . . . . 11 𝑥(𝑔𝑚)
75, 6nffv 5438 . . . . . . . . . 10 𝑥(𝐹‘(𝑔𝑚))
87nfcri 2276 . . . . . . . . 9 𝑥 𝑦 ∈ (𝐹‘(𝑔𝑚))
94, 8nfan 1545 . . . . . . . 8 𝑥(dom 𝑔 = suc 𝑚𝑦 ∈ (𝐹‘(𝑔𝑚)))
103, 9nfrexya 2477 . . . . . . 7 𝑥𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑦 ∈ (𝐹‘(𝑔𝑚)))
11 nfv 1509 . . . . . . . 8 𝑥dom 𝑔 = ∅
12 nffrec.2 . . . . . . . . 9 𝑥𝐴
1312nfcri 2276 . . . . . . . 8 𝑥 𝑦𝐴
1411, 13nfan 1545 . . . . . . 7 𝑥(dom 𝑔 = ∅ ∧ 𝑦𝐴)
1510, 14nfor 1554 . . . . . 6 𝑥(∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑦 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑦𝐴))
1615nfab 2287 . . . . 5 𝑥{𝑦 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑦 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑦𝐴))}
172, 16nfmpt 4027 . . . 4 𝑥(𝑔 ∈ V ↦ {𝑦 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑦 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑦𝐴))})
1817nfrecs 6211 . . 3 𝑥recs((𝑔 ∈ V ↦ {𝑦 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑦 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑦𝐴))}))
1918, 3nfres 4828 . 2 𝑥(recs((𝑔 ∈ V ↦ {𝑦 ∣ (∃𝑚 ∈ ω (dom 𝑔 = suc 𝑚𝑦 ∈ (𝐹‘(𝑔𝑚))) ∨ (dom 𝑔 = ∅ ∧ 𝑦𝐴))})) ↾ ω)
201, 19nfcxfr 2279 1 𝑥frec(𝐹, 𝐴)
Colors of variables: wff set class
Syntax hints:  wa 103  wo 698   = wceq 1332  wcel 1481  {cab 2126  wnfc 2269  wrex 2418  Vcvv 2689  c0 3367  cmpt 3996  suc csuc 4294  ωcom 4511  dom cdm 4546  cres 4548  cfv 5130  recscrecs 6208  freccfrec 6294
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122
This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1335  df-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ral 2422  df-rex 2423  df-rab 2426  df-v 2691  df-un 3079  df-in 3081  df-sn 3537  df-pr 3538  df-op 3540  df-uni 3744  df-br 3937  df-opab 3997  df-mpt 3998  df-xp 4552  df-res 4558  df-iota 5095  df-fv 5138  df-recs 6209  df-frec 6295
This theorem is referenced by:  nfseq  10258
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