Theorem nffrfor 4436

Description: Bound-variable hypothesis builder for well-founded relations. (Contributed by Stefan O'Rear, 20-Jan-2015.) (Revised by Mario Carneiro, 14-Oct-2016.)

Hypotheses

Ref	Expression
nffrfor.r	⊢ Ⅎ𝑥𝑅
nffrfor.a	⊢ Ⅎ𝑥𝐴
nffrfor.s	⊢ Ⅎ𝑥𝑆

Assertion

Ref	Expression
nffrfor	⊢ Ⅎ𝑥 FrFor 𝑅𝐴𝑆

Proof of Theorem nffrfor

Dummy variables 𝑢 𝑣 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-frfor 4419	. 2 ⊢ ( FrFor 𝑅𝐴𝑆 ↔ (∀𝑢 ∈ 𝐴 (∀𝑣 ∈ 𝐴 (𝑣𝑅𝑢 → 𝑣 ∈ 𝑆) → 𝑢 ∈ 𝑆) → 𝐴 ⊆ 𝑆))
2		nffrfor.a	. . . 4 ⊢ Ⅎ𝑥𝐴
3		nfcv 2372	. . . . . . . 8 ⊢ Ⅎ𝑥𝑣
4		nffrfor.r	. . . . . . . 8 ⊢ Ⅎ𝑥𝑅
5		nfcv 2372	. . . . . . . 8 ⊢ Ⅎ𝑥𝑢
6	3, 4, 5	nfbr 4129	. . . . . . 7 ⊢ Ⅎ𝑥 𝑣𝑅𝑢
7		nffrfor.s	. . . . . . . 8 ⊢ Ⅎ𝑥𝑆
8	7	nfcri 2366	. . . . . . 7 ⊢ Ⅎ𝑥 𝑣 ∈ 𝑆
9	6, 8	nfim 1618	. . . . . 6 ⊢ Ⅎ𝑥(𝑣𝑅𝑢 → 𝑣 ∈ 𝑆)
10	2, 9	nfralxy 2568	. . . . 5 ⊢ Ⅎ𝑥∀𝑣 ∈ 𝐴 (𝑣𝑅𝑢 → 𝑣 ∈ 𝑆)
11	7	nfcri 2366	. . . . 5 ⊢ Ⅎ𝑥 𝑢 ∈ 𝑆
12	10, 11	nfim 1618	. . . 4 ⊢ Ⅎ𝑥(∀𝑣 ∈ 𝐴 (𝑣𝑅𝑢 → 𝑣 ∈ 𝑆) → 𝑢 ∈ 𝑆)
13	2, 12	nfralxy 2568	. . 3 ⊢ Ⅎ𝑥∀𝑢 ∈ 𝐴 (∀𝑣 ∈ 𝐴 (𝑣𝑅𝑢 → 𝑣 ∈ 𝑆) → 𝑢 ∈ 𝑆)
14	2, 7	nfss 3217	. . 3 ⊢ Ⅎ𝑥 𝐴 ⊆ 𝑆
15	13, 14	nfim 1618	. 2 ⊢ Ⅎ𝑥(∀𝑢 ∈ 𝐴 (∀𝑣 ∈ 𝐴 (𝑣𝑅𝑢 → 𝑣 ∈ 𝑆) → 𝑢 ∈ 𝑆) → 𝐴 ⊆ 𝑆)
16	1, 15	nfxfr 1520	1 ⊢ Ⅎ𝑥 FrFor 𝑅𝐴𝑆

Syntax hints:   → wi 4  Ⅎwnf 1506   ∈ wcel 2200  Ⅎwnfc 2359  ∀wral 2508   ⊆ wss 3197   class class class wbr 4082   FrFor wfrfor 4415

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-v 2801  df-un 3201  df-in 3203  df-ss 3210  df-sn 3672  df-pr 3673  df-op 3675  df-br 4083  df-frfor 4419

This theorem is referenced by:  nffr  4437