Theorem nfop 3834

Description: Bound-variable hypothesis builder for ordered pairs. (Contributed by NM, 14-Nov-1995.)

Hypotheses

Ref	Expression
nfop.1	⊢ Ⅎ𝑥𝐴
nfop.2	⊢ Ⅎ𝑥𝐵

Assertion

Ref	Expression
nfop	⊢ Ⅎ𝑥⟨𝐴, 𝐵⟩

Proof of Theorem nfop

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-op 3641	. 2 ⊢ ⟨𝐴, 𝐵⟩ = {𝑦 ∣ (𝐴 ∈ V ∧ 𝐵 ∈ V ∧ 𝑦 ∈ {{𝐴}, {𝐴, 𝐵}})}
2		nfop.1	. . . . 5 ⊢ Ⅎ𝑥𝐴
3	2	nfel1 2358	. . . 4 ⊢ Ⅎ𝑥 𝐴 ∈ V
4		nfop.2	. . . . 5 ⊢ Ⅎ𝑥𝐵
5	4	nfel1 2358	. . . 4 ⊢ Ⅎ𝑥 𝐵 ∈ V
6	2	nfsn 3692	. . . . . 6 ⊢ Ⅎ𝑥{𝐴}
7	2, 4	nfpr 3682	. . . . . 6 ⊢ Ⅎ𝑥{𝐴, 𝐵}
8	6, 7	nfpr 3682	. . . . 5 ⊢ Ⅎ𝑥{{𝐴}, {𝐴, 𝐵}}
9	8	nfcri 2341	. . . 4 ⊢ Ⅎ𝑥 𝑦 ∈ {{𝐴}, {𝐴, 𝐵}}
10	3, 5, 9	nf3an 1588	. . 3 ⊢ Ⅎ𝑥(𝐴 ∈ V ∧ 𝐵 ∈ V ∧ 𝑦 ∈ {{𝐴}, {𝐴, 𝐵}})
11	10	nfab 2352	. 2 ⊢ Ⅎ𝑥{𝑦 ∣ (𝐴 ∈ V ∧ 𝐵 ∈ V ∧ 𝑦 ∈ {{𝐴}, {𝐴, 𝐵}})}
12	1, 11	nfcxfr 2344	1 ⊢ Ⅎ𝑥⟨𝐴, 𝐵⟩

Syntax hints:   ∧ w3a 980   ∈ wcel 2175  {cab 2190  Ⅎwnfc 2334  Vcvv 2771  {csn 3632  {cpr 3633  ⟨cop 3635

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 710  ax-5 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-10 1527  ax-11 1528  ax-i12 1529  ax-bndl 1531  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-ext 2186

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1375  df-nf 1483  df-sb 1785  df-clab 2191  df-cleq 2197  df-clel 2200  df-nfc 2336  df-v 2773  df-un 3169  df-sn 3638  df-pr 3639  df-op 3641

This theorem is referenced by:  nfopd  3835  moop2  4295  fliftfuns  5866  dfmpo  6308  qliftfuns  6705  xpf1o  6940  caucvgprprlemaddq  7820  nfseq  10600  txcnp  14714  cnmpt1t  14728  cnmpt2t  14736