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Mirrors > Home > MPE Home > Th. List > Mathboxes > elintd | Structured version Visualization version GIF version |
Description: Membership in class intersection. (Contributed by Glauco Siliprandi, 3-Jan-2021.) |
Ref | Expression |
---|---|
elintd.1 | ⊢ Ⅎ𝑥𝜑 |
elintd.2 | ⊢ (𝜑 → 𝐴 ∈ 𝑉) |
elintd.3 | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝐴 ∈ 𝑥) |
Ref | Expression |
---|---|
elintd | ⊢ (𝜑 → 𝐴 ∈ ∩ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elintd.1 | . . 3 ⊢ Ⅎ𝑥𝜑 | |
2 | elintd.3 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝐴 ∈ 𝑥) | |
3 | 2 | ex 415 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐵 → 𝐴 ∈ 𝑥)) |
4 | 1, 3 | ralrimi 3216 | . 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐵 𝐴 ∈ 𝑥) |
5 | elintd.2 | . . 3 ⊢ (𝜑 → 𝐴 ∈ 𝑉) | |
6 | elintg 4876 | . . 3 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∈ ∩ 𝐵 ↔ ∀𝑥 ∈ 𝐵 𝐴 ∈ 𝑥)) | |
7 | 5, 6 | syl 17 | . 2 ⊢ (𝜑 → (𝐴 ∈ ∩ 𝐵 ↔ ∀𝑥 ∈ 𝐵 𝐴 ∈ 𝑥)) |
8 | 4, 7 | mpbird 259 | 1 ⊢ (𝜑 → 𝐴 ∈ ∩ 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 Ⅎwnf 1780 ∈ wcel 2110 ∀wral 3138 ∩ cint 4868 |
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-int 4869 |
This theorem is referenced by: ssuniint 41335 elintdv 41336 |
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