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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 1701 changed. (Revised by Wolf Lammen, 11-Sep-2021.) Remove dependency on ax-12 2034. (Revised by Wolf Lammen, 12-Oct-2021.) |
Ref | Expression |
---|---|
nfa1 | ⊢ Ⅎ𝑥∀𝑥𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | alex 1743 | . 2 ⊢ (∀𝑥𝜑 ↔ ¬ ∃𝑥 ¬ 𝜑) | |
2 | nfe1 2014 | . . 3 ⊢ Ⅎ𝑥∃𝑥 ¬ 𝜑 | |
3 | 2 | nfn 1768 | . 2 ⊢ Ⅎ𝑥 ¬ ∃𝑥 ¬ 𝜑 |
4 | 1, 3 | nfxfr 1771 | 1 ⊢ Ⅎ𝑥∀𝑥𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∀wal 1473 ∃wex 1695 Ⅎwnf 1699 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-10 2006 |
This theorem depends on definitions: df-bi 196 df-or 384 df-ex 1696 df-nf 1701 |
This theorem is referenced by: nfna1 2016 nfia1 2017 nfnf1 2018 nfa2 2027 nf5 2102 axc4i 2116 sb56 2136 hba1 2137 nfnf1OLD 2145 axc16nfOLD 2149 19.12 2150 nfa2OLD 2154 equs5aALT 2165 equs5eALT 2166 cbv1h 2256 axc15 2291 dral1 2313 nfald2 2319 ax12v2OLD 2330 equs5a 2336 equs5e 2337 equs5 2339 axc14 2360 sbf2 2370 nfsb4t 2377 sbcom3 2399 exsb 2456 nfeu1 2468 moexex 2529 2eu6 2546 exists2 2550 nfaba1 2756 nfra1 2925 ceqsalgALT 3204 elrab3t 3330 csbie2t 3528 sbcnestgf 3947 dfnfc2 4390 dfnfc2OLD 4391 mpteq12f 4661 axrep2 4701 axrep3 4702 axrep4 4703 alxfr 4804 copsex2t 4883 mosubopt 4897 fv3 6116 fvmptt 6208 fnoprabg 6659 pssnn 8063 fiint 8122 aceq1 8823 zorn2lem4 9204 zfcndrep 9315 mreexexd 16131 mreexexdOLD 16132 dfon2lem7 30938 bj-alalbial 31879 bj-exalbial 31880 bj-biexal1 31883 bj-bialal 31886 bj-cbv1hv 31917 bj-dral1v 31936 bj-axrep2 31977 bj-axrep3 31978 bj-axrep4 31979 ax11-pm 32007 bj-mo3OLD 32022 bj-snsetex 32144 bj-xnex 32245 exlimim 32365 exellim 32368 wl-nfimf1 32492 wl-nfae1 32494 wl-sb8t 32512 wl-sbnf1 32515 wl-lem-moexsb 32529 wl-mo2tf 32532 wl-eutf 32534 wl-mo2t 32536 wl-mo3t 32537 wl-sb8eut 32538 wl-ax11-lem3 32543 wl-sbcom3 32551 sbali 33085 nfbii2 33137 setindtr 36609 axc11next 37629 iotain 37640 pm14.122b 37646 pm14.123b 37649 eubi 37659 ax6e2ndeqVD 38167 e2ebindALT 38187 ax6e2ndeqALT 38189 rexsb 39817 |
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