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Mirrors > Home > ILE Home > Th. List > nfa1 | GIF version |
Description: 𝑥 is not free in ∀𝑥𝜑. (Contributed by Mario Carneiro, 11-Aug-2016.) |
Ref | Expression |
---|---|
nfa1 | ⊢ Ⅎ𝑥∀𝑥𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hba1 1473 | . 2 ⊢ (∀𝑥𝜑 → ∀𝑥∀𝑥𝜑) | |
2 | 1 | nfi 1391 | 1 ⊢ Ⅎ𝑥∀𝑥𝜑 |
Colors of variables: wff set class |
Syntax hints: ∀wal 1282 Ⅎwnf 1389 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-gen 1378 ax-ial 1467 |
This theorem depends on definitions: df-bi 115 df-nf 1390 |
This theorem is referenced by: nfnf1 1476 nfa2 1511 nfia1 1512 alexdc 1550 nf2 1598 cbv1h 1673 sbf2 1701 sb4or 1754 nfsbxy 1859 nfsbxyt 1860 sbcomxyyz 1887 sbalyz 1916 dvelimALT 1927 nfeu1 1952 moim 2005 euexex 2026 nfaba1 2224 nfra1 2397 ceqsalg 2627 elrab3t 2748 mo2icl 2771 csbie2t 2950 sbcnestgf 2953 dfnfc2 3619 mpteq12f 3858 copsex2t 4000 ssopab2 4030 alxfr 4211 eunex 4304 mosubopt 4423 fv3 5218 fvmptt 5283 fnoprabg 5622 bj-exlimmp 10580 bdsepnft 10678 setindft 10760 strcollnft 10779 |
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