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Theorem nfpred 6312
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 6307 . 2 Pred(𝑅, 𝐴, 𝑋) = (𝐴 ∩ (◡𝑅 “ {𝑋}))
2 nfpred.2 . . 3 Ⅎ𝑥𝐴
3 nfpred.1 . . . . 5 Ⅎ𝑥𝑅
43nfcnv 5857 . . . 4 Ⅎ𝑥◡𝑅
5 nfpred.3 . . . . 5 Ⅎ𝑥𝑋
65nfsn 4664 . . . 4 Ⅎ𝑥{𝑋}
74, 6nfima 6066 . . 3 Ⅎ𝑥(◡𝑅 “ {𝑋})
82, 7nfin 4120 . 2 Ⅎ𝑥(𝐴 ∩ (◡𝑅 “ {𝑋}))
91, 8nfcxfr 2920 1 Ⅎ𝑥Pred(𝑅, 𝐴, 𝑋)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  Ⅎwnfc 2907   ∩ cin 4088  {csn 4584  ◡ccnv 5650   “ cima 5654  Predcpred 6306
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-rab 3413  df-v 3452  df-ss 3897  df-dif 4046  df-in 4090  df-un 4150  df-nul 4278  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-br 5103  df-opab 5167  df-xp 5657  df-cnv 5659  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-pred 6307
This theorem is used by:  nffrecs  8309  nfwsuc  36704  nfwlim  36708
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