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Mirrors > Home > MPE Home > Th. List > preq12 | Structured version Visualization version GIF version |
Description: Equality theorem for unordered pairs. (Contributed by NM, 19-Oct-2012.) |
Ref | Expression |
---|---|
preq12 | ⊢ ((𝐴 = 𝐶 ∧ 𝐵 = 𝐷) → {𝐴, 𝐵} = {𝐶, 𝐷}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | preq1 4212 | . 2 ⊢ (𝐴 = 𝐶 → {𝐴, 𝐵} = {𝐶, 𝐵}) | |
2 | preq2 4213 | . 2 ⊢ (𝐵 = 𝐷 → {𝐶, 𝐵} = {𝐶, 𝐷}) | |
3 | 1, 2 | sylan9eq 2664 | 1 ⊢ ((𝐴 = 𝐶 ∧ 𝐵 = 𝐷) → {𝐴, 𝐵} = {𝐶, 𝐷}) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 = wceq 1475 {cpr 4127 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-v 3175 df-un 3545 df-sn 4126 df-pr 4128 |
This theorem is referenced by: preq12i 4217 preq12d 4220 ssprsseq 4297 preq12b 4322 prnebg 4329 snex 4835 relop 5194 opthreg 8398 wwlktovfo 13549 joinval 16828 meetval 16842 ipole 16981 sylow1 17841 frgpuplem 18008 sizeusglecusglem1 26012 3v3e3cycl1 26172 4cycl4v4e 26194 4cycl4dv4e 26196 usg2wlkeq 26236 usg2wlkonot 26410 imarnf1pr 40326 uspgr2wlkeq 40854 1wlkres 40879 1wlkp1lem8 40889 usgr2pthlem 40969 21wlkdlem10 41142 11wlkdlem4 41307 31wlkdlem6 41332 31wlkdlem10 41336 |
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