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Mirrors > Home > MPE Home > Th. List > nfa1 | Structured version Visualization version GIF version |
Description: The setvar 𝑥 is not free in ∀𝑥𝜑. (Contributed by Mario Carneiro, 11-Aug-2016.) df-nf 1786 changed. (Revised by Wolf Lammen, 11-Sep-2021.) Remove dependency on ax-12 2171. (Revised by Wolf Lammen, 12-Oct-2021.) |
Ref | Expression |
---|---|
nfa1 | ⊢ Ⅎ𝑥∀𝑥𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | alex 1828 | . 2 ⊢ (∀𝑥𝜑 ↔ ¬ ∃𝑥 ¬ 𝜑) | |
2 | nfe1 2147 | . . 3 ⊢ Ⅎ𝑥∃𝑥 ¬ 𝜑 | |
3 | 2 | nfn 1860 | . 2 ⊢ Ⅎ𝑥 ¬ ∃𝑥 ¬ 𝜑 |
4 | 1, 3 | nfxfr 1855 | 1 ⊢ Ⅎ𝑥∀𝑥𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∀wal 1539 ∃wex 1781 Ⅎwnf 1785 |
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-10 2137 |
This theorem depends on definitions: df-bi 206 df-or 846 df-ex 1782 df-nf 1786 |
This theorem is referenced by: nfna1 2149 nfia1 2150 nfnf1 2151 nfs1v 2153 nfa2 2170 sbalex 2235 sbf2 2263 equs5av 2270 nf5 2278 hba1 2289 axc4i 2315 19.12 2320 exsb 2355 equs5aALT 2363 equs5eALT 2364 dral1vOLD 2367 cbv1h 2404 dral1 2438 nfald2 2444 equs5a 2456 equs5e 2457 equs5 2459 axc14 2462 nfsb4t 2498 sbcom3 2505 nfmo1 2551 nfeu1 2582 moexexlem 2622 2eu6 2652 axi12 2701 nfaba1 2911 nfaba1g 2912 nfabdwOLD 2927 nfra1 3281 nfra2wOLD 3297 ceqsalgALT 3508 elrab3t 3681 sbcbi2OLD 3839 csbie2t 3933 rexdifi 4144 sbcnestgfw 4417 sbcnestgf 4422 dfnfc2 4932 mpteq12f 5235 axrep2 5287 axrep3 5288 axrep4 5289 alxfr 5404 axprlem4 5423 axprlem5 5424 copsex2t 5491 mosubopt 5509 fv3 6906 fvmptt 7015 fnoprabg 7527 pssnn 9164 pssnnOLD 9261 fiint 9320 aceq1 10108 zorn2lem4 10490 zfcndrep 10605 mreexexd 17588 fineqvrep 34083 dfon2lem7 34749 bj-alalbial 35567 bj-exalbial 35568 bj-biexal1 35571 bj-bialal 35574 bj-cbv1hv 35662 ax11-pm 35698 bj-snsetex 35832 exlimim 36211 exellim 36213 difunieq 36243 fvineqsneq 36281 wl-nfimf1 36383 wl-nfae1 36384 wl-sb8t 36405 wl-sbnf1 36408 wl-2spsbbi 36418 wl-lem-moexsb 36421 wl-mo2tf 36424 wl-eutf 36426 wl-mo2t 36428 wl-mo3t 36429 wl-sb8eut 36430 wl-ax11-lem3 36437 sbali 36968 setindtr 41748 unielss 41952 ismnushort 43045 axc11next 43150 pm14.122b 43167 pm14.123b 43170 eubiOLD 43180 ax6e2ndeqVD 43655 e2ebindALT 43675 ax6e2ndeqALT 43677 rexsb 45793 nfich1 46101 ichnfimlem 46117 ich2al 46121 pgind 47715 |
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