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| Mirrors > Home > ILE Home > Th. List > nfop | GIF version | ||
| Description: Bound-variable hypothesis builder for ordered pairs. (Contributed by NM, 14-Nov-1995.) |
| Ref | Expression |
|---|---|
| nfop.1 | ⊢ Ⅎ𝑥𝐴 |
| nfop.2 | ⊢ Ⅎ𝑥𝐵 |
| Ref | Expression |
|---|---|
| nfop | ⊢ Ⅎ𝑥〈𝐴, 𝐵〉 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-op 3642 | . 2 ⊢ 〈𝐴, 𝐵〉 = {𝑦 ∣ (𝐴 ∈ V ∧ 𝐵 ∈ V ∧ 𝑦 ∈ {{𝐴}, {𝐴, 𝐵}})} | |
| 2 | nfop.1 | . . . . 5 ⊢ Ⅎ𝑥𝐴 | |
| 3 | 2 | nfel1 2359 | . . . 4 ⊢ Ⅎ𝑥 𝐴 ∈ V |
| 4 | nfop.2 | . . . . 5 ⊢ Ⅎ𝑥𝐵 | |
| 5 | 4 | nfel1 2359 | . . . 4 ⊢ Ⅎ𝑥 𝐵 ∈ V |
| 6 | 2 | nfsn 3693 | . . . . . 6 ⊢ Ⅎ𝑥{𝐴} |
| 7 | 2, 4 | nfpr 3683 | . . . . . 6 ⊢ Ⅎ𝑥{𝐴, 𝐵} |
| 8 | 6, 7 | nfpr 3683 | . . . . 5 ⊢ Ⅎ𝑥{{𝐴}, {𝐴, 𝐵}} |
| 9 | 8 | nfcri 2342 | . . . 4 ⊢ Ⅎ𝑥 𝑦 ∈ {{𝐴}, {𝐴, 𝐵}} |
| 10 | 3, 5, 9 | nf3an 1589 | . . 3 ⊢ Ⅎ𝑥(𝐴 ∈ V ∧ 𝐵 ∈ V ∧ 𝑦 ∈ {{𝐴}, {𝐴, 𝐵}}) |
| 11 | 10 | nfab 2353 | . 2 ⊢ Ⅎ𝑥{𝑦 ∣ (𝐴 ∈ V ∧ 𝐵 ∈ V ∧ 𝑦 ∈ {{𝐴}, {𝐴, 𝐵}})} |
| 12 | 1, 11 | nfcxfr 2345 | 1 ⊢ Ⅎ𝑥〈𝐴, 𝐵〉 |
| Colors of variables: wff set class |
| Syntax hints: ∧ w3a 981 ∈ wcel 2176 {cab 2191 Ⅎwnfc 2335 Vcvv 2772 {csn 3633 {cpr 3634 〈cop 3636 |
| 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 711 ax-5 1470 ax-7 1471 ax-gen 1472 ax-ie1 1516 ax-ie2 1517 ax-8 1527 ax-10 1528 ax-11 1529 ax-i12 1530 ax-bndl 1532 ax-4 1533 ax-17 1549 ax-i9 1553 ax-ial 1557 ax-i5r 1558 ax-ext 2187 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-nf 1484 df-sb 1786 df-clab 2192 df-cleq 2198 df-clel 2201 df-nfc 2337 df-v 2774 df-un 3170 df-sn 3639 df-pr 3640 df-op 3642 |
| This theorem is referenced by: nfopd 3836 moop2 4296 fliftfuns 5867 dfmpo 6309 qliftfuns 6706 xpf1o 6941 caucvgprprlemaddq 7821 nfseq 10602 txcnp 14743 cnmpt1t 14757 cnmpt2t 14765 |
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