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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 3772 | . 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 1398 {cpr 3692 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2216 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-v 2817 df-un 3217 df-sn 3697 df-pr 3698 |
| This theorem is referenced by: opeq1 3885 opeq2 3886 xrminrecl 11966 xrminadd 11968 prdsval 13507 xpsfval 13582 xpsval 13586 ring1 14224 xmetxp 15421 xmetxpbl 15422 txmetcnp 15432 hovera 15561 hoverb 15562 hoverlt1 15563 hovergt0 15564 ivthdich 15567 wkslem1 16364 wkslem2 16365 iswlk 16367 2wlklem 16420 isclwwlk 16438 clwwlkccatlem 16444 clwwlkccat 16445 clwwlkn2 16465 clwwlkext2edg 16466 umgr2cwwk2dif 16468 s2elclwwlknon2 16480 clwwlknonex2lem2 16482 clwwlknonex2 16483 eupthseg 16496 eupth2lem3fi 16520 |
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