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Mirrors > Home > MPE Home > Th. List > rabn0 | Structured version Visualization version GIF version |
Description: Nonempty restricted class abstraction. (Contributed by NM, 29-Aug-1999.) (Revised by BJ, 16-Jul-2021.) |
Ref | Expression |
---|---|
rabn0 | ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥 ∈ 𝐴 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rabeq0 3911 | . . 3 ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} = ∅ ↔ ∀𝑥 ∈ 𝐴 ¬ 𝜑) | |
2 | 1 | necon3abii 2828 | . 2 ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} ≠ ∅ ↔ ¬ ∀𝑥 ∈ 𝐴 ¬ 𝜑) |
3 | dfrex2 2979 | . 2 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ¬ ∀𝑥 ∈ 𝐴 ¬ 𝜑) | |
4 | 2, 3 | bitr4i 266 | 1 ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥 ∈ 𝐴 𝜑) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 195 ≠ wne 2780 ∀wral 2896 ∃wrex 2897 {crab 2900 ∅c0 3874 |
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-ne 2782 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-dif 3543 df-nul 3875 |
This theorem is referenced by: class2set 4758 reusv2 4800 exss 4858 frminex 5018 weniso 6504 onminesb 6890 onminsb 6891 onminex 6899 oeeulem 7568 supval2 8244 ordtypelem3 8308 card2on 8342 tz9.12lem3 8535 rankf 8540 scott0 8632 karden 8641 cardf2 8652 cardval3 8661 cardmin2 8707 acni3 8753 kmlem3 8857 cofsmo 8974 coftr 8978 fin23lem7 9021 enfin2i 9026 axcc4 9144 axdc3lem4 9158 ac6num 9184 pwfseqlem3 9361 wuncval 9443 wunccl 9445 tskmcl 9542 infm3 10861 nnwos 11631 zsupss 11653 zmin 11660 rpnnen1lem2 11690 rpnnen1lem1 11691 rpnnen1lem3 11692 rpnnen1lem5 11694 rpnnen1lem1OLD 11697 rpnnen1lem3OLD 11698 rpnnen1lem5OLD 11700 ioo0 12071 ico0 12092 ioc0 12093 icc0 12094 bitsfzolem 14994 lcmcllem 15147 fissn0dvdsn0 15171 odzcllem 15335 vdwnn 15540 ram0 15564 ramsey 15572 sylow2blem3 17860 iscyg2 18107 pgpfac1lem5 18301 ablfaclem2 18308 ablfaclem3 18309 ablfac 18310 lspf 18795 ordtrest2lem 20817 ordthauslem 20997 1stcfb 21058 2ndcdisj 21069 ptclsg 21228 txcon 21302 txflf 21620 tsmsfbas 21741 iscmet3 22899 minveclem3b 23007 iundisj 23123 dyadmax 23172 dyadmbllem 23173 elqaalem1 23878 elqaalem3 23880 sgmnncl 24673 musum 24717 incistruhgr 25746 uvtx01vtx 26020 spancl 27579 shsval2i 27630 ococin 27651 iundisjf 28784 iundisjfi 28942 ordtrest2NEWlem 29296 esumrnmpt2 29457 esumpinfval 29462 dmsigagen 29534 ballotlemfc0 29881 ballotlemfcc 29882 ballotlemiex 29890 ballotlemsup 29893 bnj110 30182 bnj1204 30334 bnj1253 30339 conpcon 30471 iscvm 30495 wsuclem 31017 wsuclemOLD 31018 nodenselem4 31083 poimirlem28 32607 sstotbnd2 32743 igenval 33030 igenidl 33032 pmap0 34069 pellfundre 36463 pellfundge 36464 pellfundglb 36467 dgraalem 36734 rgspncl 36758 uzwo4 38246 ioodvbdlimc1lem1 38821 fourierdlem31 39031 fourierdlem64 39063 etransclem48 39175 subsaliuncl 39252 smflimlem6 39662 prmdvdsfmtnof1lem1 40034 prmdvdsfmtnof 40036 uvtxa01vtx0 40623 |
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