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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 1781 changed. (Revised by Wolf Lammen, 11-Sep-2021.) Remove dependency on ax-12 2175. (Revised by Wolf Lammen, 12-Oct-2021.) |
Ref | Expression |
---|---|
nfa1 | ⊢ Ⅎ𝑥∀𝑥𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | alex 1823 | . 2 ⊢ (∀𝑥𝜑 ↔ ¬ ∃𝑥 ¬ 𝜑) | |
2 | nfe1 2148 | . . 3 ⊢ Ⅎ𝑥∃𝑥 ¬ 𝜑 | |
3 | 2 | nfn 1855 | . 2 ⊢ Ⅎ𝑥 ¬ ∃𝑥 ¬ 𝜑 |
4 | 1, 3 | nfxfr 1850 | 1 ⊢ Ⅎ𝑥∀𝑥𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∀wal 1535 ∃wex 1776 Ⅎwnf 1780 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-10 2139 |
This theorem depends on definitions: df-bi 207 df-or 848 df-ex 1777 df-nf 1781 |
This theorem is referenced by: nfna1 2150 nfia1 2151 nfnf1 2152 nfs1v 2154 nfa2 2174 sbalexOLD 2241 sbf2 2270 equs5av 2275 nf5 2281 hba1 2292 axc4i 2321 19.12 2326 exsb 2360 equs5aALT 2367 equs5eALT 2368 dral1vOLD 2371 cbv1h 2408 dral1 2442 nfald2 2448 equs5a 2460 equs5e 2461 equs5 2463 axc14 2466 nfsb4t 2502 sbcom3 2509 nfmo1 2555 nfeu1 2586 moexexlem 2624 2eu6 2655 axi12 2704 nfaba1 2911 nfaba1OLD 2912 nfaba1g 2913 nfra1 3282 nfra2wOLD 3298 ceqsalgALT 3516 elrab3t 3694 csbie2t 3949 rexdifi 4160 sbcnestgfw 4427 sbcnestgf 4432 dfnfc2 4934 mpteq12f 5236 axrep2 5288 axrep3 5289 axrep4OLD 5292 alxfr 5413 axprlem4OLD 5435 axprlem5OLD 5436 copsex2t 5503 mosubopt 5520 fv3 6925 fvmptt 7036 fnoprabg 7556 pssnn 9207 fiint 9364 fiintOLD 9365 aceq1 10155 zorn2lem4 10537 zfcndrep 10652 mreexexd 17693 dvelimalcased 35068 dvelimexcased 35070 fineqvrep 35088 dfon2lem7 35771 bj-alalbial 36684 bj-exalbial 36685 bj-biexal1 36688 bj-bialal 36691 bj-cbv1hv 36779 ax11-pm 36815 bj-snsetex 36946 exlimim 37325 exellim 37327 difunieq 37357 fvineqsneq 37395 wl-nfimf1 37507 wl-nfae1 37508 wl-sb8t 37533 wl-sbnf1 37536 wl-2spsbbi 37546 wl-lem-moexsb 37549 wl-mo2tf 37552 wl-eutf 37554 wl-mo2t 37556 wl-mo3t 37557 wl-sb8eut 37559 wl-ax11-lem3 37568 sbali 38099 setindtr 43013 unielss 43207 ismnushort 44297 axc11next 44402 pm14.122b 44419 pm14.123b 44422 eubiOLD 44432 ax6e2ndeqVD 44907 e2ebindALT 44927 ax6e2ndeqALT 44929 modelaxreplem2 44944 modelaxreplem3 44945 rexsb 47049 nfich1 47372 ichnfimlem 47388 ich2al 47392 pgind 48948 |
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