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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 1593 | . 2 ⊢ (∀𝑥𝜑 → ∀𝑥∀𝑥𝜑) | |
| 2 | 1 | nfi 1515 | 1 ⊢ Ⅎ𝑥∀𝑥𝜑 |
| Colors of variables: wff set class |
| Syntax hints: ∀wal 1400 Ⅎwnf 1513 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-gen 1502 ax-ial 1587 |
| This theorem depends on definitions: df-bi 117 df-nf 1514 |
| This theorem is referenced by: axc4i 1595 nfnf1 1597 nfa2 1632 nfia1 1633 alexdc 1672 nf2 1720 cbv1h 1799 sbf2 1831 sb4or 1886 nfsbxy 2002 nfsbxyt 2003 sbcomxyyz 2032 sbalyz 2059 dvelimALT 2070 hbe1a 2083 nfeu1 2097 moim 2151 euexex 2172 nfaba1 2398 nfabdw 2411 nfra1 2581 ceqsalg 2850 elrab3t 2981 mo2icl 3005 csbie2t 3196 sbcnestgf 3199 dfss4st 3464 dfnfc2 3951 mpteq12f 4209 copsex2t 4383 ssopab2 4416 alxfr 4605 eunex 4706 mosubopt 4838 fv3 5716 fvmptt 5794 fnoprabg 6183 fiintim 7232 bj-exlimmp 16780 bdsepnft 16896 setindft 16974 strcollnft 16993 dfalseu2 17151 |
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