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| Mirrors > Home > ILE Home > Th. List > nfra1 | GIF version | ||
| Description: 𝑥 is not free in ∀𝑥 ∈ 𝐴𝜑. (Contributed by NM, 18-Oct-1996.) (Revised by Mario Carneiro, 7-Oct-2016.) |
| Ref | Expression |
|---|---|
| nfra1 | ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-ral 2525 | . 2 ⊢ (∀𝑥 ∈ 𝐴 𝜑 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝜑)) | |
| 2 | nfa1 1590 | . 2 ⊢ Ⅎ𝑥∀𝑥(𝑥 ∈ 𝐴 → 𝜑) | |
| 3 | 1, 2 | nfxfr 1523 | 1 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝜑 |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∀wal 1396 Ⅎwnf 1509 ∈ wcel 2203 ∀wral 2520 |
| 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-5 1496 ax-gen 1498 ax-ial 1583 |
| This theorem depends on definitions: df-bi 117 df-nf 1510 df-ral 2525 |
| This theorem is referenced by: nfra2xy 2584 r19.12 2649 ralbi 2675 rexbi 2676 nfss 3231 ralidm 3610 nfii1 4022 dfiun2g 4023 mpteq12f 4190 reusv1 4579 ralxfrALT 4588 peano2 4717 fun11iun 5635 fvmptssdm 5762 ffnfv 5835 riota5f 6030 mpoeq123 6112 tfri3 6598 nfixp1 6953 nneneq 7111 exmidomni 7433 mkvprop 7449 caucvgsrlemgt1 8110 suplocsrlem 8123 lble 9221 indstr 9925 zsupcllemstep 10589 nninfinf 10805 fimaxre2 11912 prodeq2 12243 bezoutlemmain 12694 bezoutlemzz 12698 exmidunben 13177 mulcncf 15473 limccnp2cntop 15542 bj-rspgt 16558 isomninnlem 16814 iswomninnlem 16834 ismkvnnlem 16837 |
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