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Mirrors > Home > ILE Home > Th. List > nfsab | GIF version |
Description: Bound-variable hypothesis builder for a class abstraction. (Contributed by Mario Carneiro, 11-Aug-2016.) |
Ref | Expression |
---|---|
nfsab.1 | ⊢ Ⅎ𝑥𝜑 |
Ref | Expression |
---|---|
nfsab | ⊢ Ⅎ𝑥 𝑧 ∈ {𝑦 ∣ 𝜑} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfsab.1 | . . . 4 ⊢ Ⅎ𝑥𝜑 | |
2 | 1 | nfri 1452 | . . 3 ⊢ (𝜑 → ∀𝑥𝜑) |
3 | 2 | hbab 2072 | . 2 ⊢ (𝑧 ∈ {𝑦 ∣ 𝜑} → ∀𝑥 𝑧 ∈ {𝑦 ∣ 𝜑}) |
4 | 3 | nfi 1391 | 1 ⊢ Ⅎ𝑥 𝑧 ∈ {𝑦 ∣ 𝜑} |
Colors of variables: wff set class |
Syntax hints: Ⅎwnf 1389 ∈ wcel 1433 {cab 2067 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 |
This theorem depends on definitions: df-bi 115 df-nf 1390 df-sb 1686 df-clab 2068 |
This theorem is referenced by: nfab 2223 peano2 4336 |
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