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Mirrors > Home > MPE Home > Th. List > Mathboxes > bnj1465 | Structured version Visualization version GIF version |
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.) |
Ref | Expression |
---|---|
bnj1465.1 | ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) |
bnj1465.2 | ⊢ (𝜓 → ∀𝑥𝜓) |
bnj1465.3 | ⊢ (𝜒 → 𝜓) |
Ref | Expression |
---|---|
bnj1465 | ⊢ ((𝜒 ∧ 𝐴 ∈ 𝑉) → ∃𝑥𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bnj1465.3 | . . . 4 ⊢ (𝜒 → 𝜓) | |
2 | 1 | adantr 481 | . . 3 ⊢ ((𝜒 ∧ 𝐴 ∈ 𝑉) → 𝜓) |
3 | bnj1465.2 | . . . . 5 ⊢ (𝜓 → ∀𝑥𝜓) | |
4 | bnj1465.1 | . . . . 5 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) | |
5 | 3, 4 | bnj1464 30914 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → ([𝐴 / 𝑥]𝜑 ↔ 𝜓)) |
6 | 5 | adantl 482 | . . 3 ⊢ ((𝜒 ∧ 𝐴 ∈ 𝑉) → ([𝐴 / 𝑥]𝜑 ↔ 𝜓)) |
7 | 2, 6 | mpbird 247 | . 2 ⊢ ((𝜒 ∧ 𝐴 ∈ 𝑉) → [𝐴 / 𝑥]𝜑) |
8 | 7 | spesbcd 3522 | 1 ⊢ ((𝜒 ∧ 𝐴 ∈ 𝑉) → ∃𝑥𝜑) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 ∧ wa 384 ∀wal 1481 = wceq 1483 ∃wex 1704 ∈ wcel 1990 [wsbc 3435 |
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-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ral 2917 df-rex 2918 df-v 3202 df-sbc 3436 |
This theorem is referenced by: bnj1463 31123 |
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