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| Mirrors > Home > MPE Home > Th. List > Mathboxes > iineq1i | Structured version Visualization version GIF version | ||
| Description: Equality theorem for indexed intersection. Inference version. (Contributed by GG, 1-Sep-2025.) |
| Ref | Expression |
|---|---|
| iineq1i.1 | ⊢ 𝐴 = 𝐵 |
| Ref | Expression |
|---|---|
| iineq1i | ⊢ ∩ 𝑥 ∈ 𝐴 𝐶 = ∩ 𝑥 ∈ 𝐵 𝐶 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | iineq1i.1 | . . . . . 6 ⊢ 𝐴 = 𝐵 | |
| 2 | 1 | eleq2i 2832 | . . . . 5 ⊢ (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵) |
| 3 | 2 | imbi1i 349 | . . . 4 ⊢ ((𝑥 ∈ 𝐴 → 𝑡 ∈ 𝐶) ↔ (𝑥 ∈ 𝐵 → 𝑡 ∈ 𝐶)) |
| 4 | 3 | ralbii2 3088 | . . 3 ⊢ (∀𝑥 ∈ 𝐴 𝑡 ∈ 𝐶 ↔ ∀𝑥 ∈ 𝐵 𝑡 ∈ 𝐶) |
| 5 | 4 | abbii 2808 | . 2 ⊢ {𝑡 ∣ ∀𝑥 ∈ 𝐴 𝑡 ∈ 𝐶} = {𝑡 ∣ ∀𝑥 ∈ 𝐵 𝑡 ∈ 𝐶} |
| 6 | df-iin 4992 | . 2 ⊢ ∩ 𝑥 ∈ 𝐴 𝐶 = {𝑡 ∣ ∀𝑥 ∈ 𝐴 𝑡 ∈ 𝐶} | |
| 7 | df-iin 4992 | . 2 ⊢ ∩ 𝑥 ∈ 𝐵 𝐶 = {𝑡 ∣ ∀𝑥 ∈ 𝐵 𝑡 ∈ 𝐶} | |
| 8 | 5, 6, 7 | 3eqtr4i 2774 | 1 ⊢ ∩ 𝑥 ∈ 𝐴 𝐶 = ∩ 𝑥 ∈ 𝐵 𝐶 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1540 ∈ wcel 2108 {cab 2713 ∀wral 3060 ∩ ciin 4990 |
| 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 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-ext 2707 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1780 df-sb 2065 df-clab 2714 df-cleq 2728 df-clel 2815 df-ral 3061 df-iin 4992 |
| This theorem is referenced by: (None) |
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