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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 3775 | . 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 3695 |
| 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 3218 df-sn 3700 df-pr 3701 |
| This theorem is referenced by: opeq1 3888 opeq2 3889 xrminrecl 11986 xrminadd 11988 xpsfval 13615 prdsval 14118 xpsval 14146 ring1 14305 xmetxp 15501 xmetxpbl 15502 txmetcnp 15512 hovera 15641 hoverb 15642 hoverlt1 15643 hovergt0 15644 ivthdich 15647 wkslem1 16444 wkslem2 16445 iswlk 16447 2wlklem 16500 isclwwlk 16518 clwwlkccatlem 16524 clwwlkccat 16525 clwwlkn2 16545 clwwlkext2edg 16546 umgr2cwwk2dif 16548 s2elclwwlknon2 16560 clwwlknonex2lem2 16562 clwwlknonex2 16563 eupthseg 16576 eupth2lem3fi 16600 |
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