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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 12065 xrminadd 12067 xpsfval 13729 prdsval 14281 xpsval 14309 ring1 14472 xmetxp 15745 xmetxpbl 15746 txmetcnp 15756 hovera 15885 hoverb 15886 hoverlt1 15887 hovergt0 15888 ivthdich 15891 wkslem1 16778 wkslem2 16779 iswlk 16781 2wlklem 16834 isclwwlk 16852 clwwlkccatlem 16858 clwwlkccat 16859 clwwlkn2 16879 clwwlkext2edg 16880 umgr2cwwk2dif 16882 s2elclwwlknon2 16894 clwwlknonex2lem2 16896 clwwlknonex2 16897 eupthseg 16910 eupth2lem3fi 16934 |
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