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Mirrors > Home > MPE Home > Th. List > cleljustab | Structured version Visualization version GIF version |
Description: Extension of cleljust 2113 from formulas of the form "setvar ∈ setvar" to formulas of the form "setvar ∈ class abstraction". This is an instance of dfclel 2809 where the containing class is a class abstraction. The same remarks as for eleq1ab 2709 apply. (Contributed by BJ, 8-Nov-2021.) (Proof shortened by Steven Nguyen, 19-May-2023.) |
Ref | Expression |
---|---|
cleljustab | ⊢ (𝑥 ∈ {𝑦 ∣ 𝜑} ↔ ∃𝑧(𝑧 = 𝑥 ∧ 𝑧 ∈ {𝑦 ∣ 𝜑})) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1ab 2709 | . . 3 ⊢ (𝑧 = 𝑥 → (𝑧 ∈ {𝑦 ∣ 𝜑} ↔ 𝑥 ∈ {𝑦 ∣ 𝜑})) | |
2 | 1 | equsexvw 2006 | . 2 ⊢ (∃𝑧(𝑧 = 𝑥 ∧ 𝑧 ∈ {𝑦 ∣ 𝜑}) ↔ 𝑥 ∈ {𝑦 ∣ 𝜑}) |
3 | 2 | bicomi 223 | 1 ⊢ (𝑥 ∈ {𝑦 ∣ 𝜑} ↔ ∃𝑧(𝑧 = 𝑥 ∧ 𝑧 ∈ {𝑦 ∣ 𝜑})) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 205 ∧ wa 394 ∃wex 1779 ∈ wcel 2104 {cab 2707 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 |
This theorem depends on definitions: df-bi 206 df-an 395 df-ex 1780 df-sb 2066 df-clab 2708 |
This theorem is referenced by: (None) |
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