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| Mirrors > Home > ILE Home > Th. List > preq12d | GIF version | ||
| Description: Equality deduction for unordered pairs. (Contributed by NM, 19-Oct-2012.) |
| Ref | Expression |
|---|---|
| preq1d.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
| preq12d.2 | ⊢ (𝜑 → 𝐶 = 𝐷) |
| Ref | Expression |
|---|---|
| preq12d | ⊢ (𝜑 → {𝐴, 𝐶} = {𝐵, 𝐷}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | preq1d.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 2 | preq12d.2 | . 2 ⊢ (𝜑 → 𝐶 = 𝐷) | |
| 3 | preq12 3750 | . 2 ⊢ ((𝐴 = 𝐵 ∧ 𝐶 = 𝐷) → {𝐴, 𝐶} = {𝐵, 𝐷}) | |
| 4 | 1, 2, 3 | syl2anc 411 | 1 ⊢ (𝜑 → {𝐴, 𝐶} = {𝐵, 𝐷}) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1397 {cpr 3670 |
| 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-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 |
| This theorem is referenced by: opeq1 3862 opeq2 3863 xrminrecl 11835 xrminadd 11837 prdsval 13358 xpsfval 13433 xpsval 13437 ring1 14075 xmetxp 15234 xmetxpbl 15235 txmetcnp 15245 hovera 15374 hoverb 15375 hoverlt1 15376 hovergt0 15377 ivthdich 15380 wkslem1 16174 wkslem2 16175 iswlk 16177 2wlklem 16230 isclwwlk 16248 clwwlkccatlem 16254 clwwlkccat 16255 clwwlkn2 16275 clwwlkext2edg 16276 umgr2cwwk2dif 16278 s2elclwwlknon2 16290 clwwlknonex2lem2 16292 clwwlknonex2 16293 eupthseg 16306 eupth2lem3fi 16330 |
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