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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 1794 sbf2 1826 sb4or 1881 nfsbxy 1995 nfsbxyt 1996 sbcomxyyz 2025 sbalyz 2052 dvelimALT 2063 hbe1a 2076 nfeu1 2090 moim 2144 euexex 2165 nfaba1 2381 nfabdw 2394 nfra1 2564 ceqsalg 2832 elrab3t 2962 mo2icl 2986 csbie2t 3177 sbcnestgf 3180 dfss4st 3442 dfnfc2 3916 mpteq12f 4174 copsex2t 4343 ssopab2 4376 alxfr 4564 eunex 4665 mosubopt 4797 fv3 5671 fvmptt 5747 fnoprabg 6132 fiintim 7166 bj-exlimmp 16467 bdsepnft 16583 setindft 16661 strcollnft 16680 |
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