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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 2513 | . 2 ⊢ (∀𝑥 ∈ 𝐴 𝜑 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝜑)) | |
| 2 | nfa1 1587 | . 2 ⊢ Ⅎ𝑥∀𝑥(𝑥 ∈ 𝐴 → 𝜑) | |
| 3 | 1, 2 | nfxfr 1520 | 1 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝜑 |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∀wal 1393 Ⅎwnf 1506 ∈ wcel 2200 ∀wral 2508 |
| 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 1493 ax-gen 1495 ax-ial 1580 |
| This theorem depends on definitions: df-bi 117 df-nf 1507 df-ral 2513 |
| This theorem is referenced by: nfra2xy 2572 r19.12 2637 ralbi 2663 rexbi 2664 nfss 3217 ralidm 3592 nfii1 3996 dfiun2g 3997 mpteq12f 4164 reusv1 4549 ralxfrALT 4558 peano2 4687 fun11iun 5595 fvmptssdm 5721 ffnfv 5795 riota5f 5987 mpoeq123 6069 tfri3 6519 nfixp1 6873 nneneq 7026 exmidomni 7320 mkvprop 7336 caucvgsrlemgt1 7993 suplocsrlem 8006 lble 9105 indstr 9800 zsupcllemstep 10461 nninfinf 10677 fimaxre2 11754 prodeq2 12084 bezoutlemmain 12535 bezoutlemzz 12539 exmidunben 13013 mulcncf 15298 limccnp2cntop 15367 bj-rspgt 16233 isomninnlem 16486 iswomninnlem 16505 ismkvnnlem 16508 |
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