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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 5849 oveq2 6025 cbvoprab2 6093 ovg 6160 opabex3d 6282 opabex3 6283 op1stg 6312 op2ndg 6313 oprssdmm 6333 op1steq 6341 dfoprab4f 6355 elmpom 6402 tfrlemibxssdm 6492 tfr1onlembxssdm 6508 tfrcllembxssdm 6521 elixpsn 6903 ixpsnf1o 6904 mapsnen 6985 xpsnen 7004 xpassen 7013 xpf1o 7029 djulclr 7247 djurclr 7248 djulcl 7249 djurcl 7250 djulclb 7253 inl11 7263 djuss 7268 1stinl 7272 2ndinl 7273 1stinr 7274 2ndinr 7275 elreal 8047 ax1rid 8096 fseq1p1m1 10328 pfxval 11254 swrdccatin1 11305 swrdccat3blem 11319 imasaddfnlemg 13396 cnmpt21 15014 djucllem 16396 |
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