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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 1779 changed. (Revised by Wolf Lammen, 11-Sep-2021.) Remove dependency on ax-12 2167. (Revised by Wolf Lammen, 12-Oct-2021.) |
Ref | Expression |
---|---|
nfa1 | ⊢ Ⅎ𝑥∀𝑥𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | alex 1821 | . 2 ⊢ (∀𝑥𝜑 ↔ ¬ ∃𝑥 ¬ 𝜑) | |
2 | nfe1 2140 | . . 3 ⊢ Ⅎ𝑥∃𝑥 ¬ 𝜑 | |
3 | 2 | nfn 1853 | . 2 ⊢ Ⅎ𝑥 ¬ ∃𝑥 ¬ 𝜑 |
4 | 1, 3 | nfxfr 1848 | 1 ⊢ Ⅎ𝑥∀𝑥𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∀wal 1532 ∃wex 1774 Ⅎwnf 1778 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-10 2130 |
This theorem depends on definitions: df-bi 206 df-or 847 df-ex 1775 df-nf 1779 |
This theorem is referenced by: nfna1 2142 nfia1 2143 nfnf1 2144 nfs1v 2146 nfa2 2166 sbalex 2231 sbf2 2259 equs5av 2266 nf5 2272 hba1 2283 axc4i 2311 19.12 2316 exsb 2351 equs5aALT 2359 equs5eALT 2360 dral1vOLD 2363 cbv1h 2400 dral1 2434 nfald2 2440 equs5a 2452 equs5e 2453 equs5 2455 axc14 2458 nfsb4t 2494 sbcom3 2501 nfmo1 2547 nfeu1 2578 moexexlem 2618 2eu6 2648 axi12 2697 nfaba1 2907 nfaba1g 2908 nfabdwOLD 2923 nfra1 3277 nfra2wOLD 3293 ceqsalgALT 3505 elrab3t 3680 csbie2t 3931 rexdifi 4142 sbcnestgfw 4415 sbcnestgf 4420 dfnfc2 4928 mpteq12f 5231 axrep2 5283 axrep3 5284 axrep4 5285 alxfr 5402 axprlem4 5421 axprlem5 5422 copsex2t 5489 mosubopt 5507 fv3 6910 fvmptt 7020 fnoprabg 7538 pssnn 9187 pssnnOLD 9284 fiint 9343 aceq1 10135 zorn2lem4 10517 zfcndrep 10632 mreexexd 17622 fineqvrep 34710 dfon2lem7 35380 bj-alalbial 36173 bj-exalbial 36174 bj-biexal1 36177 bj-bialal 36180 bj-cbv1hv 36268 ax11-pm 36304 bj-snsetex 36437 exlimim 36816 exellim 36818 difunieq 36848 fvineqsneq 36886 wl-nfimf1 36988 wl-nfae1 36989 wl-sb8t 37014 wl-sbnf1 37017 wl-2spsbbi 37027 wl-lem-moexsb 37030 wl-mo2tf 37033 wl-eutf 37035 wl-mo2t 37037 wl-mo3t 37038 wl-sb8eut 37040 wl-ax11-lem3 37049 sbali 37580 setindtr 42436 unielss 42637 ismnushort 43729 axc11next 43834 pm14.122b 43851 pm14.123b 43854 eubiOLD 43864 ax6e2ndeqVD 44339 e2ebindALT 44359 ax6e2ndeqALT 44361 rexsb 46470 nfich1 46778 ichnfimlem 46794 ich2al 46798 pgind 48139 |
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