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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 3090 | . 2 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
| 2 | nfe1 2185 | . 2 ⊢ Ⅎ𝑥∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑) | |
| 3 | 1, 2 | nfxfr 1883 | 1 ⊢ Ⅎ𝑥∃𝑥 ∈ 𝐴 𝜑 |
| Colors of variables: wff setvar class |
| Syntax hints: ∧ wa 400 ∃wex 1809 Ⅎwnf 1813 ∈ wcel 2143 ∃wrex 3089 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-10 2176 |
| This theorem depends on definitions: df-bi 210 df-ex 1810 df-nf 1814 df-rex 3090 |
| This theorem is referenced by: 2rmorex 3717 2reurex 3723 reuan 3850 2reu4lem 4484 nfiu1 4992 reusv2lem3 5371 fvelimad 6948 fsnex 7281 eusvobj2 7402 fiun 7936 f1iun 7937 zfregclOLD 9553 scott0 9856 ac6c4 10460 lbzbi 12955 mreiincl 17643 lss1d 21084 neiptopnei 23289 neitr 23337 utopsnneiplem 24404 cfilucfil 24716 2sqmo 27601 nosupbnd2 27880 noinfbnd2 27895 mpteleeOLD 29245 isch3 31593 atom1d 32705 opreu2reuALT 32823 iinabrex 32914 xrofsup 33112 locfinreflem 34230 esumc 34441 esumrnmpt2 34458 hasheuni 34475 esumcvg 34476 esumcvgre 34481 voliune 34619 volfiniune 34620 ddemeas 34626 eulerpartlemgvv 34766 bnj900 35317 bnj1189 35397 bnj1204 35400 bnj1398 35422 bnj1444 35431 bnj1445 35432 bnj1446 35433 bnj1447 35434 bnj1467 35442 bnj1518 35452 bnj1519 35453 iooelexlt 38008 fvineqsneq 38058 ptrest 38270 poimirlem26 38297 indexa 38384 filbcmb 38391 sdclem1 38394 heibor1 38461 dihglblem5 42072 unielss 43945 oaun3lem1 44101 suprnmpt 45892 disjinfi 45910 upbdrech 46024 ssfiunibd 46028 infxrunb2 46083 supxrunb3 46114 iccshift 46234 iooshift 46238 islpcn 46353 limsupre 46355 limclner 46365 limsupre3uzlem 46449 climuzlem 46457 xlimmnfv 46548 xlimpnfv 46552 itgperiod 46695 stoweidlem53 46767 stoweidlem57 46771 fourierdlem48 46868 fourierdlem51 46871 fourierdlem73 46893 fourierdlem81 46901 elaa2 46948 etransclem32 46980 sge0iunmptlemre 47129 voliunsge0lem 47186 meaiuninc3v 47198 isomenndlem 47244 ovnsubaddlem1 47284 hoidmvlelem1 47309 hoidmvlelem5 47313 smfaddlem1 47477 2reu7 47848 2reu8 47849 f1oresf1o2 48028 mogoldbb 48550 2zrngagrp 49014 2zrngmmgm 49017 |
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