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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 4340 | . . 3 ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} = ∅ ↔ ∀𝑥 ∈ 𝐴 ¬ 𝜑) | |
2 | 1 | necon3abii 3064 | . 2 ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} ≠ ∅ ↔ ¬ ∀𝑥 ∈ 𝐴 ¬ 𝜑) |
3 | dfrex2 3241 | . 2 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ¬ ∀𝑥 ∈ 𝐴 ¬ 𝜑) | |
4 | 2, 3 | bitr4i 280 | 1 ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥 ∈ 𝐴 𝜑) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 208 ≠ wne 3018 ∀wral 3140 ∃wrex 3141 {crab 3144 ∅c0 4293 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-ral 3145 df-rex 3146 df-rab 3149 df-dif 3941 df-nul 4294 |
This theorem is referenced by: class2set 5256 reusv2 5306 exss 5357 frminex 5537 weniso 7109 onminesb 7515 onminsb 7516 onminex 7524 oeeulem 8229 supval2 8921 ordtypelem3 8986 card2on 9020 tz9.12lem3 9220 rankf 9225 scott0 9317 karden 9326 cardf2 9374 cardval3 9383 cardmin2 9429 acni3 9475 kmlem3 9580 cofsmo 9693 coftr 9697 fin23lem7 9740 enfin2i 9745 axcc4 9863 axdc3lem4 9877 ac6num 9903 pwfseqlem3 10084 wuncval 10166 wunccl 10168 tskmcl 10265 infm3 11602 nnwos 12318 zsupss 12340 zmin 12347 rpnnen1lem2 12379 rpnnen1lem1 12380 rpnnen1lem3 12381 rpnnen1lem5 12383 ioo0 12766 ico0 12787 ioc0 12788 icc0 12789 bitsfzolem 15785 lcmcllem 15942 fissn0dvdsn0 15966 odzcllem 16131 vdwnn 16336 ram0 16360 ramsey 16368 sylow2blem3 18749 iscyg2 19003 pgpfac1lem5 19203 ablfaclem2 19210 ablfaclem3 19211 ablfac 19212 lspf 19748 ordtrest2lem 21813 ordthauslem 21993 1stcfb 22055 2ndcdisj 22066 ptclsg 22225 txconn 22299 txflf 22616 tsmsfbas 22738 iscmet3 23898 minveclem3b 24033 iundisj 24151 dyadmax 24201 dyadmbllem 24202 elqaalem1 24910 elqaalem3 24912 sgmnncl 25726 musum 25770 incistruhgr 26866 uvtx01vtx 27181 spancl 29115 shsval2i 29166 ococin 29187 iundisjf 30341 iundisjfi 30521 ordtrest2NEWlem 31167 esumrnmpt2 31329 esumpinfval 31334 dmsigagen 31405 ballotlemfc0 31752 ballotlemfcc 31753 ballotlemiex 31761 ballotlemsup 31764 bnj110 32132 bnj1204 32286 bnj1253 32291 connpconn 32484 iscvm 32508 wsuclem 33114 conway 33266 poimirlem28 34922 sstotbnd2 35054 igenval 35341 igenidl 35343 pmap0 36903 pellfundre 39485 pellfundge 39486 pellfundglb 39489 dgraalem 39752 rgspncl 39776 uzwo4 41322 ioodvbdlimc1lem1 42223 fourierdlem31 42430 fourierdlem64 42462 etransclem48 42574 subsaliuncl 42648 smflimlem6 43059 smfpimcc 43089 prmdvdsfmtnof1lem1 43753 prmdvdsfmtnof 43755 |
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