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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 1433 | . 2 ⊢ (∀𝑥𝜑 → ∀𝑥∀𝑥𝜑) | |
2 | 1 | nfi 1351 | 1 ⊢ Ⅎ𝑥∀𝑥𝜑 |
Colors of variables: wff set class |
Syntax hints: ∀wal 1241 Ⅎwnf 1349 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-gen 1338 ax-ial 1427 |
This theorem depends on definitions: df-bi 110 df-nf 1350 |
This theorem is referenced by: nfnf1 1436 nfa2 1471 nfia1 1472 alexdc 1510 nf2 1558 cbv1h 1633 sbf2 1661 sb4or 1714 nfsbxy 1818 nfsbxyt 1819 sbcomxyyz 1846 sbalyz 1875 dvelimALT 1886 nfeu1 1911 moim 1964 euexex 1985 nfaba1 2183 nfra1 2355 ceqsalg 2582 elrab3t 2697 mo2icl 2720 csbie2t 2894 sbcnestgf 2897 dfnfc2 3598 mpteq12f 3837 copsex2t 3982 ssopab2 4012 alxfr 4193 eunex 4285 mosubopt 4405 fv3 5197 fvmptt 5262 fnoprabg 5602 bj-exlimmp 9909 bdsepnft 10007 setindft 10090 strcollnft 10109 |
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