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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 3769 | . 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 3689 |
| 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 2214 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-v 2814 df-un 3214 df-sn 3694 df-pr 3695 |
| This theorem is referenced by: opeq1 3882 opeq2 3883 xrminrecl 11951 xrminadd 11953 prdsval 13475 xpsfval 13550 xpsval 13554 ring1 14192 xmetxp 15359 xmetxpbl 15360 txmetcnp 15370 hovera 15499 hoverb 15500 hoverlt1 15501 hovergt0 15502 ivthdich 15505 wkslem1 16302 wkslem2 16303 iswlk 16305 2wlklem 16358 isclwwlk 16376 clwwlkccatlem 16382 clwwlkccat 16383 clwwlkn2 16403 clwwlkext2edg 16404 umgr2cwwk2dif 16406 s2elclwwlknon2 16418 clwwlknonex2lem2 16420 clwwlknonex2 16421 eupthseg 16434 eupth2lem3fi 16458 |
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