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| Mirrors > Home > ILE Home > Th. List > opeq2 | GIF version | ||
| Description: Equality theorem for ordered pairs. (Contributed by NM, 25-Jun-1998.) (Revised by Mario Carneiro, 26-Apr-2015.) |
| Ref | Expression |
|---|---|
| opeq2 | ⊢ (𝐴 = 𝐵 → 〈𝐶, 𝐴〉 = 〈𝐶, 𝐵〉) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 2294 | . . . . . 6 ⊢ (𝐴 = 𝐵 → (𝐴 ∈ V ↔ 𝐵 ∈ V)) | |
| 2 | 1 | anbi2d 464 | . . . . 5 ⊢ (𝐴 = 𝐵 → ((𝐶 ∈ V ∧ 𝐴 ∈ V) ↔ (𝐶 ∈ V ∧ 𝐵 ∈ V))) |
| 3 | eqidd 2232 | . . . . . . 7 ⊢ (𝐴 = 𝐵 → {𝐶} = {𝐶}) | |
| 4 | preq2 3749 | . . . . . . 7 ⊢ (𝐴 = 𝐵 → {𝐶, 𝐴} = {𝐶, 𝐵}) | |
| 5 | 3, 4 | preq12d 3756 | . . . . . 6 ⊢ (𝐴 = 𝐵 → {{𝐶}, {𝐶, 𝐴}} = {{𝐶}, {𝐶, 𝐵}}) |
| 6 | 5 | eleq2d 2301 | . . . . 5 ⊢ (𝐴 = 𝐵 → (𝑥 ∈ {{𝐶}, {𝐶, 𝐴}} ↔ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}})) |
| 7 | 2, 6 | anbi12d 473 | . . . 4 ⊢ (𝐴 = 𝐵 → (((𝐶 ∈ V ∧ 𝐴 ∈ V) ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}}) ↔ ((𝐶 ∈ V ∧ 𝐵 ∈ V) ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}}))) |
| 8 | df-3an 1006 | . . . 4 ⊢ ((𝐶 ∈ V ∧ 𝐴 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}}) ↔ ((𝐶 ∈ V ∧ 𝐴 ∈ V) ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}})) | |
| 9 | df-3an 1006 | . . . 4 ⊢ ((𝐶 ∈ V ∧ 𝐵 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}}) ↔ ((𝐶 ∈ V ∧ 𝐵 ∈ V) ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}})) | |
| 10 | 7, 8, 9 | 3bitr4g 223 | . . 3 ⊢ (𝐴 = 𝐵 → ((𝐶 ∈ V ∧ 𝐴 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}}) ↔ (𝐶 ∈ V ∧ 𝐵 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}}))) |
| 11 | 10 | abbidv 2349 | . 2 ⊢ (𝐴 = 𝐵 → {𝑥 ∣ (𝐶 ∈ V ∧ 𝐴 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}})} = {𝑥 ∣ (𝐶 ∈ V ∧ 𝐵 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}})}) |
| 12 | df-op 3678 | . 2 ⊢ 〈𝐶, 𝐴〉 = {𝑥 ∣ (𝐶 ∈ V ∧ 𝐴 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}})} | |
| 13 | df-op 3678 | . 2 ⊢ 〈𝐶, 𝐵〉 = {𝑥 ∣ (𝐶 ∈ V ∧ 𝐵 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}})} | |
| 14 | 11, 12, 13 | 3eqtr4g 2289 | 1 ⊢ (𝐴 = 𝐵 → 〈𝐶, 𝐴〉 = 〈𝐶, 𝐵〉) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∧ w3a 1004 = wceq 1397 ∈ wcel 2202 {cab 2217 Vcvv 2802 {csn 3669 {cpr 3670 〈cop 3672 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-v 2804 df-un 3204 df-sn 3675 df-pr 3676 df-op 3678 |
| This theorem is referenced by: opeq12 3864 opeq2i 3866 opeq2d 3869 oteq2 3872 oteq3 3873 breq2 4092 cbvopab2 4163 cbvopab2v 4166 opthg 4330 eqvinop 4335 opelopabsb 4354 opelxp 4755 opabid2 4861 elrn2g 4920 opeldm 4934 opeldmg 4936 elrn2 4974 opelresg 5020 iss 5059 elimasng 5104 issref 5119 dmsnopg 5208 cnvsng 5222 elxp4 5224 elxp5 5225 dffun5r 5338 funopg 5360 f1osng 5626 tz6.12f 5668 fsn 5819 fsng 5820 fvsng 5850 oveq2 6026 cbvoprab2 6094 ovg 6161 opabex3d 6283 opabex3 6284 op1stg 6313 op2ndg 6314 oprssdmm 6334 op1steq 6342 dfoprab4f 6356 elmpom 6403 tfrlemibxssdm 6493 tfr1onlembxssdm 6509 tfrcllembxssdm 6522 elixpsn 6904 ixpsnf1o 6905 mapsnen 6986 xpsnen 7005 xpassen 7014 xpf1o 7030 djulclr 7248 djurclr 7249 djulcl 7250 djurcl 7251 djulclb 7254 inl11 7264 djuss 7269 1stinl 7273 2ndinl 7274 1stinr 7275 2ndinr 7276 elreal 8048 ax1rid 8097 fseq1p1m1 10329 pfxval 11259 swrdccatin1 11310 swrdccat3blem 11324 imasaddfnlemg 13402 cnmpt21 15021 djucllem 16422 |
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