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| Mirrors > Home > MPE Home > Th. List > nfre1 | Structured version Visualization version GIF version | ||
| Description: The setvar 𝑥 is not free in ∃𝑥 ∈ 𝐴𝜑. (Contributed by NM, 19-Mar-1997.) (Revised by Mario Carneiro, 7-Oct-2016.) |
| Ref | Expression |
|---|---|
| nfre1 | ⊢ Ⅎ𝑥∃𝑥 ∈ 𝐴 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-rex 3087 | . 2 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
| 2 | nfe1 2184 | . 2 ⊢ Ⅎ𝑥∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑) | |
| 3 | 1, 2 | nfxfr 1873 | 1 ⊢ Ⅎ𝑥∃𝑥 ∈ 𝐴 𝜑 |
| Colors of variables: wff setvar class |
| Syntax hints: ∧ wa 399 ∃wex 1799 Ⅎwnf 1803 ∈ wcel 2142 ∃wrex 3086 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1815 ax-4 1829 ax-10 2175 |
| This theorem depends on definitions: df-bi 209 df-ex 1800 df-nf 1804 df-rex 3087 |
| This theorem is referenced by: 2rmorex 3717 2reurex 3723 reuan 3849 2reu4lem 4477 nfiu1 4985 reusv2lem3 5357 fvelimad 6934 fsnex 7267 eusvobj2 7388 fiun 7924 f1iun 7925 zfregclOLD 9543 scott0 9844 ac6c4 10438 lbzbi 12937 mreiincl 17624 lss1d 21027 neiptopnei 23189 neitr 23237 utopsnneiplem 24304 cfilucfil 24616 2sqmo 27498 nosupbnd2 27777 noinfbnd2 27792 mpteleeOLD 29093 isch3 31441 atom1d 32553 opreu2reuALT 32673 iinabrex 32766 xrofsup 32966 locfinreflem 34134 esumc 34345 esumrnmpt2 34362 hasheuni 34379 esumcvg 34380 esumcvgre 34385 voliune 34523 volfiniune 34524 ddemeas 34530 eulerpartlemgvv 34670 bnj900 35221 bnj1189 35301 bnj1204 35304 bnj1398 35326 bnj1444 35335 bnj1445 35336 bnj1446 35337 bnj1447 35338 bnj1467 35346 bnj1518 35356 bnj1519 35357 iooelexlt 37853 fvineqsneq 37903 ptrest 38115 poimirlem26 38142 indexa 38229 filbcmb 38236 sdclem1 38239 heibor1 38306 dihglblem5 41919 unielss 43792 oaun3lem1 43948 suprnmpt 45749 disjinfi 45767 upbdrech 45881 ssfiunibd 45885 infxrunb2 45940 supxrunb3 45971 iccshift 46091 iooshift 46095 islpcn 46210 limsupre 46212 limclner 46222 limsupre3uzlem 46306 climuzlem 46314 xlimmnfv 46405 xlimpnfv 46409 itgperiod 46552 stoweidlem53 46624 stoweidlem57 46628 fourierdlem48 46725 fourierdlem51 46728 fourierdlem73 46750 fourierdlem81 46758 elaa2 46805 etransclem32 46837 sge0iunmptlemre 46986 voliunsge0lem 47043 meaiuninc3v 47055 isomenndlem 47101 ovnsubaddlem1 47141 hoidmvlelem1 47166 hoidmvlelem5 47170 smfaddlem1 47334 2reu7 47702 2reu8 47703 f1oresf1o2 47882 mogoldbb 48404 2zrngagrp 48868 2zrngmmgm 48871 |
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