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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 2175. (Revised by Wolf Lammen, 12-Oct-2021.) |
Ref | Expression |
---|---|
nfa1 | ⊢ Ⅎ𝑥∀𝑥𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | alex 1827 | . 2 ⊢ (∀𝑥𝜑 ↔ ¬ ∃𝑥 ¬ 𝜑) | |
2 | nfe1 2151 | . . 3 ⊢ Ⅎ𝑥∃𝑥 ¬ 𝜑 | |
3 | 2 | nfn 1858 | . 2 ⊢ Ⅎ𝑥 ¬ ∃𝑥 ¬ 𝜑 |
4 | 1, 3 | nfxfr 1854 | 1 ⊢ Ⅎ𝑥∀𝑥𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∀wal 1536 ∃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 2142 |
This theorem depends on definitions: df-bi 210 df-or 845 df-ex 1782 df-nf 1786 |
This theorem is referenced by: nfna1 2153 nfia1 2154 nfnf1 2155 nfs1v 2157 nfa2 2174 sbf2 2269 sb56OLD 2275 equs5av 2276 nf5 2286 hba1 2297 axc4i 2330 19.12 2335 exsb 2367 equs5aALT 2373 equs5eALT 2374 dral1v 2376 cbv1h 2414 dral1 2450 nfald2 2456 equs5a 2469 equs5e 2470 equs5 2472 axc14 2475 nfsb4t 2517 sbcom3 2525 nfsb4tALT 2580 nfmo1 2616 nfeu1 2649 moexexlem 2688 2eu6 2719 axi12 2768 nfaba1 2963 nfaba1g 2964 nfabdw 2976 nfra1 3183 ceqsalgALT 3477 elrab3t 3627 sbcbi2OLD 3779 csbie2t 3866 rexdifi 4073 sbcnestgfw 4326 sbcnestgf 4331 dfnfc2 4822 mpteq12f 5113 axrep2 5157 axrep3 5158 axrep4 5159 alxfr 5273 axprlem4 5292 axprlem5 5293 copsex2t 5348 mosubopt 5365 fv3 6663 fvmptt 6765 fnoprabg 7254 pssnn 8720 fiint 8779 aceq1 9528 zorn2lem4 9910 zfcndrep 10025 mreexexd 16911 dfon2lem7 33147 bj-alalbial 34148 bj-exalbial 34149 bj-biexal1 34152 bj-bialal 34155 bj-cbv1hv 34233 ax11-pm 34270 bj-snsetex 34399 exlimim 34759 exellim 34761 difunieq 34791 fvineqsneq 34829 wl-nfimf1 34931 wl-nfae1 34932 wl-sb8t 34953 wl-sbnf1 34956 wl-2spsbbi 34966 wl-lem-moexsb 34969 wl-mo2tf 34972 wl-eutf 34974 wl-mo2t 34976 wl-mo3t 34977 wl-sb8eut 34978 wl-ax11-lem3 34984 sbali 35550 setindtr 39965 axc11next 41110 pm14.122b 41127 pm14.123b 41130 eubiOLD 41140 ax6e2ndeqVD 41615 e2ebindALT 41635 ax6e2ndeqALT 41637 rexsb 43654 nfich1 43964 ichnfimlem 43980 ich2al 43984 |
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