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Theorem nfpred 6335
Description: Bound-variable hypothesis builder for the predecessor class. (Contributed by Scott Fenton, 9-Jun-2018.)
Hypotheses
Ref Expression
nfpred.1 Ⅎ𝑥𝑅
nfpred.2 Ⅎ𝑥𝐴
nfpred.3 Ⅎ𝑥𝑋
Assertion
Ref Expression
nfpred Ⅎ𝑥Pred(𝑅, 𝐴, 𝑋)

Proof of Theorem nfpred
StepHypRef Expression
1 df-pred 6330 . 2 Pred(𝑅, 𝐴, 𝑋) = (𝐴 ∩ (◡𝑅 “ {𝑋}))
2 nfpred.2 . . 3 Ⅎ𝑥𝐴
3 nfpred.1 . . . . 5 Ⅎ𝑥𝑅
43nfcnv 5868 . . . 4 Ⅎ𝑥◡𝑅
5 nfpred.3 . . . . 5 Ⅎ𝑥𝑋
65nfsn 4669 . . . 4 Ⅎ𝑥{𝑋}
74, 6nfima 6082 . . 3 Ⅎ𝑥(◡𝑅 “ {𝑋})
82, 7nfin 4124 . 2 Ⅎ𝑥(𝐴 ∩ (◡𝑅 “ {𝑋}))
91, 8nfcxfr 2924 1 Ⅎ𝑥Pred(𝑅, 𝐴, 𝑋)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  Ⅎwnfc 2911   ∩ cin 4092  {csn 4588  ◡ccnv 5657   “ cima 5661  Predcpred 6329
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4841  df-br 5109  df-opab 5174  df-xp 5664  df-cnv 5666  df-dm 5668  df-rn 5669  df-res 5670  df-ima 5671  df-pred 6330
This theorem is used by:  nffrecs  8339  nfwsuc  36795  nfwlim  36799
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