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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 1589 | . 2 ⊢ (∀𝑥𝜑 → ∀𝑥∀𝑥𝜑) | |
| 2 | 1 | nfi 1511 | 1 ⊢ Ⅎ𝑥∀𝑥𝜑 |
| Colors of variables: wff set class |
| Syntax hints: ∀wal 1396 Ⅎwnf 1509 |
| 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 1498 ax-ial 1583 |
| This theorem depends on definitions: df-bi 117 df-nf 1510 |
| This theorem is referenced by: axc4i 1591 nfnf1 1593 nfa2 1628 nfia1 1629 alexdc 1668 nf2 1716 cbv1h 1795 sbf2 1827 sb4or 1882 nfsbxy 1996 nfsbxyt 1997 sbcomxyyz 2026 sbalyz 2053 dvelimALT 2064 hbe1a 2077 nfeu1 2091 moim 2145 euexex 2166 nfaba1 2390 nfabdw 2403 nfra1 2573 ceqsalg 2841 elrab3t 2971 mo2icl 2995 csbie2t 3186 sbcnestgf 3189 dfss4st 3453 dfnfc2 3931 mpteq12f 4189 copsex2t 4360 ssopab2 4393 alxfr 4581 eunex 4682 mosubopt 4814 fv3 5692 fvmptt 5768 fnoprabg 6153 fiintim 7190 bj-exlimmp 16533 bdsepnft 16649 setindft 16727 strcollnft 16746 |
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