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Mirrors > Home > MPE Home > Th. List > rabeq0 | Structured version Visualization version GIF version |
Description: Condition for a restricted class abstraction to be empty. (Contributed by Jeff Madsen, 7-Jun-2010.) (Revised by BJ, 16-Jul-2021.) |
Ref | Expression |
---|---|
rabeq0 | ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} = ∅ ↔ ∀𝑥 ∈ 𝐴 ¬ 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ab0 4319 | . 2 ⊢ ({𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} = ∅ ↔ ∀𝑥 ¬ (𝑥 ∈ 𝐴 ∧ 𝜑)) | |
2 | df-rab 3147 | . . 3 ⊢ {𝑥 ∈ 𝐴 ∣ 𝜑} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} | |
3 | 2 | eqeq1i 2826 | . 2 ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} = ∅ ↔ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} = ∅) |
4 | raln 3155 | . 2 ⊢ (∀𝑥 ∈ 𝐴 ¬ 𝜑 ↔ ∀𝑥 ¬ (𝑥 ∈ 𝐴 ∧ 𝜑)) | |
5 | 1, 3, 4 | 3bitr4i 305 | 1 ⊢ ({𝑥 ∈ 𝐴 ∣ 𝜑} = ∅ ↔ ∀𝑥 ∈ 𝐴 ¬ 𝜑) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 208 ∧ wa 398 ∀wal 1535 = wceq 1537 ∈ wcel 2114 {cab 2799 ∀wral 3138 {crab 3142 ∅c0 4279 |
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 2793 |
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 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rab 3147 df-dif 3927 df-nul 4280 |
This theorem is referenced by: rabn0 4325 rabnc 4327 dffr2 5506 frc 5507 frirr 5518 wereu2 5538 tz6.26 6165 fndmdifeq0 6800 fnnfpeq0 6926 wemapso2 9003 wemapwe 9146 hashbclem 13800 hashbc 13801 wrdnfi 13885 smuval2 15814 smupvallem 15815 smu01lem 15817 smumullem 15824 phiprmpw 16096 hashgcdeq 16109 prmreclem4 16238 cshws0 16418 pmtrsn 18630 efgsfo 18848 00lsp 19736 dsmm0cl 20867 ordthauslem 21974 pthaus 22229 xkohaus 22244 hmeofval 22349 mumul 25744 musum 25754 ppiub 25766 lgsquadlem2 25943 umgrnloop0 26880 lfgrnloop 26896 numedglnl 26915 usgrnloop0ALT 26973 lfuhgr1v0e 27022 nbuhgr 27111 nbumgr 27115 uhgrnbgr0nb 27122 nbgr0vtxlem 27123 vtxd0nedgb 27256 vtxdusgr0edgnelALT 27264 1loopgrnb0 27270 usgrvd0nedg 27301 vtxdginducedm1lem4 27310 wwlks 27599 iswwlksnon 27617 iswspthsnon 27620 0enwwlksnge1 27628 wspn0 27688 rusgr0edg 27737 clwwlk 27746 clwwlkn 27789 clwwlkn0 27791 clwwlknon 27853 clwwlknon1nloop 27862 clwwlknondisj 27874 vdn0conngrumgrv2 27959 eupth2lemb 28000 eulercrct 28005 frgrregorufr0 28087 numclwwlk3lem2 28147 ofldchr 30894 measvuni 31480 dya2iocuni 31548 repr0 31889 reprlt 31897 reprgt 31899 subfacp1lem6 32439 prv1n 32685 frpomin 33085 frpomin2 33086 poimirlem26 34952 poimirlem27 34953 cnambfre 34974 itg2addnclem2 34978 areacirclem5 35018 0dioph 39467 undisjrab 40728 supminfxr 41830 dvnprodlem3 42323 pimltmnf2 43069 pimconstlt0 43072 pimgtpnf2 43075 rmsupp0 44501 lcoc0 44562 rrxsphere 44820 |
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