Theorem nfpred 6293

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 6288	. 2 ⊢ Pred(𝑅, 𝐴, 𝑋) = (𝐴 ∩ (◡𝑅 “ {𝑋}))
2		nfpred.2	. . 3 ⊢ Ⅎ𝑥𝐴
3		nfpred.1	. . . . 5 ⊢ Ⅎ𝑥𝑅
4	3	nfcnv 5850	. . . 4 ⊢ Ⅎ𝑥◡𝑅
5		nfpred.3	. . . . 5 ⊢ Ⅎ𝑥𝑋
6	5	nfsn 4666	. . . 4 ⊢ Ⅎ𝑥{𝑋}
7	4, 6	nfima 6057	. . 3 ⊢ Ⅎ𝑥(◡𝑅 “ {𝑋})
8	2, 7	nfin 4176	. 2 ⊢ Ⅎ𝑥(𝐴 ∩ (◡𝑅 “ {𝑋}))
9	1, 8	nfcxfr 2922	1 ⊢ Ⅎ𝑥Pred(𝑅, 𝐴, 𝑋)

Syntax hints:  Ⅎwnfc 2909   ∩ cin 3903  {csn 4582  ^◡ccnv 5646   “ cima 5650  Predcpred 6287

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1815  ax-4 1829  ax-5 1930  ax-6 1987  ax-7 2028  ax-8 2144  ax-9 2152  ax-10 2175  ax-11 2191  ax-12 2212  ax-ext 2734

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1100  df-tru 1563  df-fal 1573  df-ex 1800  df-nf 1804  df-sb 2091  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-rab 3415  df-v 3456  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4481  df-sn 4583  df-pr 4585  df-op 4589  df-br 5101  df-opab 5163  df-xp 5653  df-cnv 5655  df-dm 5657  df-rn 5658  df-res 5659  df-ima 5660  df-pred 6288

This theorem is referenced by:  nffrecs  8264  nfwsuc  36166  nfwlim  36170