Theorem nfpred 5602

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

Step	Hyp	Ref	Expression
1		df-pred 5597	. 2 ⊢ Pred(𝑅, 𝐴, 𝑋) = (𝐴 ∩ (◡𝑅 “ {𝑋}))
2		nfpred.2	. . 3 ⊢ Ⅎ𝑥𝐴
3		nfpred.1	. . . . 5 ⊢ Ⅎ𝑥𝑅
4	3	nfcnv 5223	. . . 4 ⊢ Ⅎ𝑥◡𝑅
5		nfpred.3	. . . . 5 ⊢ Ⅎ𝑥𝑋
6	5	nfsn 4189	. . . 4 ⊢ Ⅎ𝑥{𝑋}
7	4, 6	nfima 5393	. . 3 ⊢ Ⅎ𝑥(◡𝑅 “ {𝑋})
8	2, 7	nfin 3782	. 2 ⊢ Ⅎ𝑥(𝐴 ∩ (◡𝑅 “ {𝑋}))
9	1, 8	nfcxfr 2749	1 ⊢ Ⅎ𝑥Pred(𝑅, 𝐴, 𝑋)

Syntax hints:  Ⅎwnfc 2738   ∩ cin 3539  {csn 4125  ^◡ccnv 5037   “ cima 5041  Predcpred 5596

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-rab 2905  df-v 3175  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-br 4584  df-opab 4644  df-xp 5044  df-cnv 5046  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597

This theorem is referenced by:  nfwrecs  7296  nfwsuc  31008  nfwlim  31012