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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 4292 | . . 3 ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} = ∅ ↔ ∀𝑥 ∈ 𝐴 ¬ 𝜑) | |
2 | 1 | necon3abii 3033 | . 2 ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} ≠ ∅ ↔ ¬ ∀𝑥 ∈ 𝐴 ¬ 𝜑) |
3 | dfrex2 3202 | . 2 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ¬ ∀𝑥 ∈ 𝐴 ¬ 𝜑) | |
4 | 2, 3 | bitr4i 281 | 1 ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥 ∈ 𝐴 𝜑) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 209 ≠ wne 2987 ∀wral 3106 ∃wrex 3107 {crab 3110 ∅c0 4243 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-rab 3115 df-dif 3884 df-nul 4244 |
This theorem is referenced by: class2set 5219 reusv2 5269 exss 5320 frminex 5499 weniso 7086 onminesb 7493 onminsb 7494 onminex 7502 oeeulem 8210 supval2 8903 ordtypelem3 8968 card2on 9002 tz9.12lem3 9202 rankf 9207 scott0 9299 karden 9308 cardf2 9356 cardval3 9365 cardmin2 9412 acni3 9458 kmlem3 9563 cofsmo 9680 coftr 9684 fin23lem7 9727 enfin2i 9732 axcc4 9850 axdc3lem4 9864 ac6num 9890 pwfseqlem3 10071 wuncval 10153 wunccl 10155 tskmcl 10252 infm3 11587 nnwos 12303 zsupss 12325 zmin 12332 rpnnen1lem2 12364 rpnnen1lem1 12365 rpnnen1lem3 12366 rpnnen1lem5 12368 ioo0 12751 ico0 12772 ioc0 12773 icc0 12774 bitsfzolem 15773 lcmcllem 15930 fissn0dvdsn0 15954 odzcllem 16119 vdwnn 16324 ram0 16348 ramsey 16356 sylow2blem3 18739 iscyg2 18994 pgpfac1lem5 19194 ablfaclem2 19201 ablfaclem3 19202 ablfac 19203 lspf 19739 ordtrest2lem 21808 ordthauslem 21988 1stcfb 22050 2ndcdisj 22061 ptclsg 22220 txconn 22294 txflf 22611 tsmsfbas 22733 iscmet3 23897 minveclem3b 24032 iundisj 24152 dyadmax 24202 dyadmbllem 24203 elqaalem1 24915 elqaalem3 24917 sgmnncl 25732 musum 25776 incistruhgr 26872 uvtx01vtx 27187 spancl 29119 shsval2i 29170 ococin 29191 iundisjf 30352 iundisjfi 30545 ordtrest2NEWlem 31275 esumrnmpt2 31437 esumpinfval 31442 dmsigagen 31513 ballotlemfc0 31860 ballotlemfcc 31861 ballotlemiex 31869 ballotlemsup 31872 bnj110 32240 bnj1204 32394 bnj1253 32399 connpconn 32595 iscvm 32619 wsuclem 33225 conway 33377 poimirlem28 35085 sstotbnd2 35212 igenval 35499 igenidl 35501 pmap0 37061 fsuppind 39456 pellfundre 39822 pellfundge 39823 pellfundglb 39826 dgraalem 40089 rgspncl 40113 uzwo4 41687 ioodvbdlimc1lem1 42573 fourierdlem31 42780 fourierdlem64 42812 etransclem48 42924 subsaliuncl 42998 smflimlem6 43409 smfpimcc 43439 prmdvdsfmtnof1lem1 44101 prmdvdsfmtnof 44103 |
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