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Mirrors > Home > MPE Home > Th. List > nfsbd | Structured version Visualization version GIF version |
Description: Deduction version of nfsb 2440. (Contributed by NM, 15-Feb-2013.) |
Ref | Expression |
---|---|
nfsbd.1 | ⊢ Ⅎ𝑥𝜑 |
nfsbd.2 | ⊢ (𝜑 → Ⅎ𝑧𝜓) |
Ref | Expression |
---|---|
nfsbd | ⊢ (𝜑 → Ⅎ𝑧[𝑦 / 𝑥]𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfsbd.1 | . . . 4 ⊢ Ⅎ𝑥𝜑 | |
2 | nfsbd.2 | . . . 4 ⊢ (𝜑 → Ⅎ𝑧𝜓) | |
3 | 1, 2 | alrimi 2082 | . . 3 ⊢ (𝜑 → ∀𝑥Ⅎ𝑧𝜓) |
4 | nfsb4t 2389 | . . 3 ⊢ (∀𝑥Ⅎ𝑧𝜓 → (¬ ∀𝑧 𝑧 = 𝑦 → Ⅎ𝑧[𝑦 / 𝑥]𝜓)) | |
5 | 3, 4 | syl 17 | . 2 ⊢ (𝜑 → (¬ ∀𝑧 𝑧 = 𝑦 → Ⅎ𝑧[𝑦 / 𝑥]𝜓)) |
6 | axc16nf 2137 | . 2 ⊢ (∀𝑧 𝑧 = 𝑦 → Ⅎ𝑧[𝑦 / 𝑥]𝜓) | |
7 | 5, 6 | pm2.61d2 172 | 1 ⊢ (𝜑 → Ⅎ𝑧[𝑦 / 𝑥]𝜓) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∀wal 1481 Ⅎwnf 1708 [wsb 1880 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 |
This theorem is referenced by: nfabd2 2784 wl-sb8eut 33359 |
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