Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
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 2172. (Revised by Wolf Lammen, 12-Oct-2021.) |
Ref | Expression |
---|---|
nfa1 | ⊢ Ⅎ𝑥∀𝑥𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | alex 1822 | . 2 ⊢ (∀𝑥𝜑 ↔ ¬ ∃𝑥 ¬ 𝜑) | |
2 | nfe1 2150 | . . 3 ⊢ Ⅎ𝑥∃𝑥 ¬ 𝜑 | |
3 | 2 | nfn 1853 | . 2 ⊢ Ⅎ𝑥 ¬ ∃𝑥 ¬ 𝜑 |
4 | 1, 3 | nfxfr 1849 | 1 ⊢ Ⅎ𝑥∀𝑥𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∀wal 1531 ∃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 2141 |
This theorem depends on definitions: df-bi 209 df-or 844 df-ex 1777 df-nf 1781 |
This theorem is referenced by: nfna1 2152 nfia1 2153 nfnf1 2154 nfa2 2171 sbf2 2267 nfs1v 2269 sb56OLD 2274 equs5av 2275 nf5 2286 hba1 2297 spsbimvOLD 2324 axc4i 2337 19.12 2342 exsb 2374 equs5aALT 2380 equs5eALT 2381 dral1v 2383 cbv1h 2421 dral1 2457 nfald2 2463 equs5a 2476 equs5e 2477 equs5 2479 axc14 2482 nfsb4t 2535 sbcom3 2544 nfsb4tALT 2600 nfmo1 2637 nfeu1 2670 moexexlem 2707 2eu6 2740 axi12 2789 nfaba1 2986 nfaba1g 2987 nfabdw 3000 nfra1 3219 ceqsalgALT 3531 elrab3t 3679 sbcbi2 3831 csbie2t 3921 rexdifi 4122 sbcnestgfw 4370 sbcnestgf 4375 dfnfc2 4850 mpteq12f 5142 axrep2 5186 axrep3 5187 axrep4 5188 alxfr 5300 axprlem4 5319 axprlem5 5320 copsex2t 5376 mosubopt 5393 fv3 6683 fvmptt 6783 fnoprabg 7269 pssnn 8730 fiint 8789 aceq1 9537 zorn2lem4 9915 zfcndrep 10030 mreexexd 16913 dfon2lem7 33029 bj-alalbial 34030 bj-exalbial 34031 bj-biexal1 34034 bj-bialal 34037 bj-cbv1hv 34113 ax11-pm 34150 bj-snsetex 34270 exlimim 34617 exellim 34619 difunieq 34649 fvineqsneq 34687 wl-nfimf1 34760 wl-nfae1 34761 wl-sb8t 34782 wl-sbnf1 34785 wl-2spsbbi 34795 wl-lem-moexsb 34798 wl-mo2tf 34801 wl-eutf 34803 wl-mo2t 34805 wl-mo3t 34806 wl-sb8eut 34807 wl-ax11-lem3 34813 sbali 35384 setindtr 39614 axc11next 40731 pm14.122b 40748 pm14.123b 40751 eubiOLD 40761 ax6e2ndeqVD 41236 e2ebindALT 41256 ax6e2ndeqALT 41258 rexsb 43290 nfich1 43600 dfich2bi 43608 ichnfimlem2 43615 ich2al 43621 |
Copyright terms: Public domain | W3C validator |