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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 3790 | . 2 ⊢ ((𝐴 = 𝐵 ∧ 𝐶 = 𝐷) → {𝐴, 𝐶} = {𝐵, 𝐷}) | |
| 4 | 1, 2, 3 | syl2anc 415 | 1 ⊢ (𝜑 → {𝐴, 𝐶} = {𝐵, 𝐷}) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 = wceq 1402 {cpr 3710 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-un 3224 df-sn 3715 df-pr 3716 |
| This theorem is used by: opeq1 3904 opeq2 3905 xrminrecl 12041 xrminadd 12043 xpsfval 13671 prdsval 14175 xpsval 14203 ring1 14366 xmetxp 15610 xmetxpbl 15611 txmetcnp 15621 hovera 15750 hoverb 15751 hoverlt1 15752 hovergt0 15753 ivthdich 15756 wkslem1 16573 wkslem2 16574 iswlk 16576 2wlklem 16629 isclwwlk 16647 clwwlkccatlem 16653 clwwlkccat 16654 clwwlkn2 16674 clwwlkext2edg 16675 umgr2cwwk2dif 16677 s2elclwwlknon2 16689 clwwlknonex2lem2 16691 clwwlknonex2 16692 eupthseg 16705 eupth2lem3fi 16729 |
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