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Mirrors > Home > MPE Home > Th. List > ectocl | Structured version Visualization version GIF version |
Description: Implicit substitution of class for equivalence class. (Contributed by NM, 23-Jul-1995.) (Revised by Mario Carneiro, 9-Jul-2014.) |
Ref | Expression |
---|---|
ectocl.1 | ⊢ 𝑆 = (𝐵 / 𝑅) |
ectocl.2 | ⊢ ([𝑥]𝑅 = 𝐴 → (𝜑 ↔ 𝜓)) |
ectocl.3 | ⊢ (𝑥 ∈ 𝐵 → 𝜑) |
Ref | Expression |
---|---|
ectocl | ⊢ (𝐴 ∈ 𝑆 → 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | tru 1537 | . 2 ⊢ ⊤ | |
2 | ectocl.1 | . . 3 ⊢ 𝑆 = (𝐵 / 𝑅) | |
3 | ectocl.2 | . . 3 ⊢ ([𝑥]𝑅 = 𝐴 → (𝜑 ↔ 𝜓)) | |
4 | ectocl.3 | . . . 4 ⊢ (𝑥 ∈ 𝐵 → 𝜑) | |
5 | 4 | adantl 484 | . . 3 ⊢ ((⊤ ∧ 𝑥 ∈ 𝐵) → 𝜑) |
6 | 2, 3, 5 | ectocld 8363 | . 2 ⊢ ((⊤ ∧ 𝐴 ∈ 𝑆) → 𝜓) |
7 | 1, 6 | mpan 688 | 1 ⊢ (𝐴 ∈ 𝑆 → 𝜓) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 = wceq 1533 ⊤wtru 1534 ∈ wcel 2110 [cec 8286 / cqs 8287 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rex 3144 df-qs 8294 |
This theorem is referenced by: vitalilem2 24209 |
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