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Mirrors > Home > ILE Home > Th. List > hbsbd | GIF version |
Description: Deduction version of hbsb 1864. (Contributed by NM, 15-Feb-2013.) (Proof rewritten by Jim Kingdon, 23-Mar-2018.) |
Ref | Expression |
---|---|
hbsbd.1 | ⊢ (𝜑 → ∀𝑥𝜑) |
hbsbd.2 | ⊢ (𝜑 → ∀𝑧𝜑) |
hbsbd.3 | ⊢ (𝜑 → (𝜓 → ∀𝑧𝜓)) |
Ref | Expression |
---|---|
hbsbd | ⊢ (𝜑 → ([𝑦 / 𝑥]𝜓 → ∀𝑧[𝑦 / 𝑥]𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hbsbd.2 | . . . 4 ⊢ (𝜑 → ∀𝑧𝜑) | |
2 | 1 | nfi 1391 | . . 3 ⊢ Ⅎ𝑧𝜑 |
3 | hbsbd.3 | . . . . . . 7 ⊢ (𝜑 → (𝜓 → ∀𝑧𝜓)) | |
4 | 1, 3 | nfdh 1457 | . . . . . 6 ⊢ (𝜑 → Ⅎ𝑧𝜓) |
5 | 2, 4 | nfim1 1503 | . . . . 5 ⊢ Ⅎ𝑧(𝜑 → 𝜓) |
6 | 5 | nfsb 1863 | . . . 4 ⊢ Ⅎ𝑧[𝑦 / 𝑥](𝜑 → 𝜓) |
7 | hbsbd.1 | . . . . . 6 ⊢ (𝜑 → ∀𝑥𝜑) | |
8 | 7 | sbrim 1871 | . . . . 5 ⊢ ([𝑦 / 𝑥](𝜑 → 𝜓) ↔ (𝜑 → [𝑦 / 𝑥]𝜓)) |
9 | 8 | nfbii 1402 | . . . 4 ⊢ (Ⅎ𝑧[𝑦 / 𝑥](𝜑 → 𝜓) ↔ Ⅎ𝑧(𝜑 → [𝑦 / 𝑥]𝜓)) |
10 | 6, 9 | mpbi 143 | . . 3 ⊢ Ⅎ𝑧(𝜑 → [𝑦 / 𝑥]𝜓) |
11 | 2, 10 | nfrimi 1458 | . 2 ⊢ (𝜑 → Ⅎ𝑧[𝑦 / 𝑥]𝜓) |
12 | 11 | nfrd 1453 | 1 ⊢ (𝜑 → ([𝑦 / 𝑥]𝜓 → ∀𝑧[𝑦 / 𝑥]𝜓)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∀wal 1282 Ⅎwnf 1389 [wsb 1685 |
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 |
This theorem is referenced by: (None) |
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