| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 2515 | . 2 ⊢ (∀𝑥 ∈ 𝐴 𝜑 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝜑)) | |
| 2 | nfa1 1589 | . 2 ⊢ Ⅎ𝑥∀𝑥(𝑥 ∈ 𝐴 → 𝜑) | |
| 3 | 1, 2 | nfxfr 1522 | 1 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝜑 |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∀wal 1395 Ⅎwnf 1508 ∈ wcel 2202 ∀wral 2510 |
| 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 1495 ax-gen 1497 ax-ial 1582 |
| This theorem depends on definitions: df-bi 117 df-nf 1509 df-ral 2515 |
| This theorem is referenced by: nfra2xy 2574 r19.12 2639 ralbi 2665 rexbi 2666 nfss 3220 ralidm 3595 nfii1 4001 dfiun2g 4002 mpteq12f 4169 reusv1 4555 ralxfrALT 4564 peano2 4693 fun11iun 5604 fvmptssdm 5731 ffnfv 5805 riota5f 5997 mpoeq123 6079 tfri3 6532 nfixp1 6886 nneneq 7042 exmidomni 7340 mkvprop 7356 caucvgsrlemgt1 8014 suplocsrlem 8027 lble 9126 indstr 9826 zsupcllemstep 10488 nninfinf 10704 fimaxre2 11787 prodeq2 12117 bezoutlemmain 12568 bezoutlemzz 12572 exmidunben 13046 mulcncf 15331 limccnp2cntop 15400 bj-rspgt 16382 isomninnlem 16634 iswomninnlem 16653 ismkvnnlem 16656 |
| Copyright terms: Public domain | W3C validator |