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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 3091 | . 2 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
| 2 | nfe1 2190 | . 2 ⊢ Ⅎ𝑥∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑) | |
| 3 | 1, 2 | nfxfr 1886 | 1 ⊢ Ⅎ𝑥∃𝑥 ∈ 𝐴 𝜑 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∧ wa 401 ∃wex 1812 Ⅎwnf 1816 ∈ wcel 2147 ∃wrex 3090 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-10 2180 |
| This proof depends on definitions: df-bi 210 df-ex 1813 df-nf 1817 df-rex 3091 |
| This theorem is used by: 2rmorex 3715 2reurex 3721 reuan 3848 2reu4lem 4482 nfiu1 4991 reusv2lem3 5369 fvelimad 6983 fsnex 7322 eusvobj2 7443 fiun 7989 f1iun 7990 zfregclOLD 9626 scott0b 9974 scott0OLD 9975 ac6c4 10598 lbzbi 13103 mreiincl 17816 lss1d 21289 neiptopnei 23505 neitr 23553 utopsnneiplem 24621 cfilucfil 24933 2sqmo 27821 nosupbnd2 28130 noinfbnd2 28145 mpteleeOLD 29530 isch3 31900 atom1d 33012 opreu2reuALT 33172 iinabrex 33261 xrofsup 33455 locfinreflem 34583 esumc 34794 esumrnmpt2 34811 hasheuni 34828 esumcvg 34829 esumcvgre 34834 voliune 34973 volfiniune 34974 ddemeas 34980 eulerpartlemgvv 35119 bnj900 35670 bnj1189 35750 bnj1204 35753 bnj1398 35775 bnj1444 35784 bnj1445 35785 bnj1446 35786 bnj1447 35787 bnj1467 35795 bnj1518 35805 bnj1519 35806 srepdf 36128 iooelexlt 38553 fvineqsneq 38603 ptrest 38805 poimirlem26 38832 indexa 38935 filbcmb 38940 sdclem1 38943 heibor1 39010 dihglblem5 42621 unielss 44481 oaun3lem1 44637 suprnmpt 46462 disjinfi 46480 upbdrech 46594 ssfiunibd 46598 infxrunb2 46652 supxrunb3 46683 iccshift 46803 iooshift 46807 islpcn 46922 limsupre 46924 limclner 46934 limsupre3uzlem 47018 climuzlem 47026 xlimmnfv 47117 xlimpnfv 47121 itgperiod 47264 stoweidlem53 47336 stoweidlem57 47340 fourierdlem48 47437 fourierdlem51 47440 fourierdlem73 47462 fourierdlem81 47470 elaa2 47517 etransclem32 47549 sge0iunmptlemre 47698 voliunsge0lem 47755 meaiuninc3v 47767 isomenndlem 47813 ovnsubaddlem1 47853 hoidmvlelem1 47878 hoidmvlelem5 47882 smfaddlem1 48046 2reu7 48455 2reu8 48456 f1oresf1o2 48634 mogoldbb 49156 2zrngagrp 49619 2zrngmmgm 49622 |
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