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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 1520 | . 2 ⊢ (∀𝑥𝜑 → ∀𝑥∀𝑥𝜑) | |
2 | 1 | nfi 1438 | 1 ⊢ Ⅎ𝑥∀𝑥𝜑 |
Colors of variables: wff set class |
Syntax hints: ∀wal 1329 Ⅎwnf 1436 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-gen 1425 ax-ial 1514 |
This theorem depends on definitions: df-bi 116 df-nf 1437 |
This theorem is referenced by: nfnf1 1523 nfa2 1558 nfia1 1559 alexdc 1598 nf2 1646 cbv1h 1723 sbf2 1751 sb4or 1805 nfsbxy 1913 nfsbxyt 1914 sbcomxyyz 1943 sbalyz 1972 dvelimALT 1983 nfeu1 2008 moim 2061 euexex 2082 nfaba1 2285 nfra1 2464 ceqsalg 2709 elrab3t 2834 mo2icl 2858 csbie2t 3043 sbcnestgf 3046 dfss4st 3304 dfnfc2 3749 mpteq12f 4003 copsex2t 4162 ssopab2 4192 alxfr 4377 eunex 4471 mosubopt 4599 fv3 5437 fvmptt 5505 fnoprabg 5865 fiintim 6810 bj-exlimmp 12965 bdsepnft 13074 setindft 13152 strcollnft 13171 |
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