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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 2533 | . 2 ⊢ (∀𝑥 ∈ 𝐴 𝜑 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝜑)) | |
| 2 | nfa1 1594 | . 2 ⊢ Ⅎ𝑥∀𝑥(𝑥 ∈ 𝐴 → 𝜑) | |
| 3 | 1, 2 | nfxfr 1527 | 1 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝜑 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∀wal 1400 Ⅎwnf 1513 ∈ wcel 2209 ∀wral 2528 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-gen 1502 ax-ial 1587 |
| This proof depends on definitions: df-bi 117 df-nf 1514 df-ral 2533 |
| This theorem is used by: nfra2xy 2592 r19.12 2657 ralbi 2683 rexbi 2684 nfss 3241 ralidm 3628 nfii1 4043 dfiun2g 4044 mpteq12f 4211 reusv1 4604 ralxfrALT 4613 peano2 4742 fun11iun 5660 fvmptssdm 5790 ffnfv 5866 riota5f 6065 mpoeq123 6147 abrexss 6358 tfri3 6638 nfixp1 7000 nneneq 7158 exmidomni 7483 mkvprop 7499 caucvgsrlemgt1 8163 suplocsrlem 8176 lble 9280 indstr 10003 zsupcllemstep 10673 nninfinf 10895 fimaxre2 12010 prodeq2 12343 bezoutlemmain 12794 bezoutlemzz 12798 exmidunben 13369 mulcncf 15800 limccnp2cntop 15869 bj-rspgt 16980 isomninnlem 17245 iswomninnlem 17266 ismkvnnlem 17269 |
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