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Mirrors > Home > MPE Home > Th. List > rexcom4 | Structured version Visualization version GIF version |
Description: Commutation of restricted and unrestricted existential quantifiers. (Contributed by NM, 12-Apr-2004.) (Proof shortened by Andrew Salmon, 8-Jun-2011.) |
Ref | Expression |
---|---|
rexcom4 | ⊢ (∃𝑥 ∈ 𝐴 ∃𝑦𝜑 ↔ ∃𝑦∃𝑥 ∈ 𝐴 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rexcom 3080 | . 2 ⊢ (∃𝑥 ∈ 𝐴 ∃𝑦 ∈ V 𝜑 ↔ ∃𝑦 ∈ V ∃𝑥 ∈ 𝐴 𝜑) | |
2 | rexv 3193 | . . 3 ⊢ (∃𝑦 ∈ V 𝜑 ↔ ∃𝑦𝜑) | |
3 | 2 | rexbii 3023 | . 2 ⊢ (∃𝑥 ∈ 𝐴 ∃𝑦 ∈ V 𝜑 ↔ ∃𝑥 ∈ 𝐴 ∃𝑦𝜑) |
4 | rexv 3193 | . 2 ⊢ (∃𝑦 ∈ V ∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑦∃𝑥 ∈ 𝐴 𝜑) | |
5 | 1, 3, 4 | 3bitr3i 289 | 1 ⊢ (∃𝑥 ∈ 𝐴 ∃𝑦𝜑 ↔ ∃𝑦∃𝑥 ∈ 𝐴 𝜑) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 195 ∃wex 1695 ∃wrex 2897 Vcvv 3173 |
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-ral 2901 df-rex 2902 df-v 3175 |
This theorem is referenced by: rexcom4a 3199 reuind 3378 uni0b 4399 iuncom4 4464 dfiun2g 4488 iunn0 4516 iunxiun 4544 iinexg 4751 inuni 4753 iunopab 4936 xpiundi 5096 xpiundir 5097 cnvuni 5231 dmiun 5255 elres 5355 elsnres 5356 rniun 5462 xpdifid 5481 imaco 5557 coiun 5562 abrexco 6406 imaiun 6407 fliftf 6465 fun11iun 7019 oprabrexex2 7049 releldm2 7109 oarec 7529 omeu 7552 eroveu 7729 dfac5lem2 8830 genpass 9710 supaddc 10867 supadd 10868 supmul1 10869 supmullem2 10871 supmul 10872 pceu 15389 4sqlem12 15498 mreiincl 16079 psgneu 17749 ntreq0 20691 unisngl 21140 metrest 22139 metuel2 22180 istrkg2ld 25159 el2wlkonot 26396 el2spthonot 26397 el2wlkonotot0 26399 fpwrelmapffslem 28895 omssubaddlem 29688 omssubadd 29689 bnj906 30254 nofulllem5 31105 bj-elsngl 32149 bj-restn0 32224 ismblfin 32620 itg2addnclem3 32633 sdclem1 32709 prter2 33184 lshpsmreu 33414 islpln5 33839 islvol5 33883 cdlemftr3 34871 mapdpglem3 35982 hdmapglem7a 36237 diophrex 36357 imaiun1 36962 coiun1 36963 upbdrech 38460 |
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