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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 4212 reusv1 4606 ralxfrALT 4615 peano2 4744 fun11iun 5663 fvmptssdm 5793 ffnfv 5869 riota5f 6068 mpoeq123 6150 abrexss 6362 tfri3 6643 nfixp1 7006 nneneq 7164 exmidomni 7488 mkvprop 7504 caucvgsrlemgt1 8168 suplocsrlem 8181 lble 9285 indstr 10008 zsupcllemstep 10678 nninfinf 10900 fimaxre2 12015 prodeq2 12348 bezoutlemmain 12799 bezoutlemzz 12803 exmidunben 13374 mulcncf 15851 limccnp2cntop 15920 bj-rspgt 17036 isomninnlem 17302 iswomninnlem 17323 ismkvnnlem 17326 |
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