| Mathbox for Rodolfo Medina |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > prtlem100 | Structured version Visualization version GIF version | ||
| Description: Lemma for prter3 39580. (Contributed by Rodolfo Medina, 19-Oct-2010.) |
| Ref | Expression |
|---|---|
| prtlem100 | ⊢ (∃𝑥 ∈ 𝐴 (𝐵 ∈ 𝑥 ∧ 𝜑) ↔ ∃𝑥 ∈ (𝐴 ∖ {∅})(𝐵 ∈ 𝑥 ∧ 𝜑)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | anass 473 | . . 3 ⊢ (((𝑥 ∈ 𝐴 ∧ 𝑥 ≠ ∅) ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)) ↔ (𝑥 ∈ 𝐴 ∧ (𝑥 ≠ ∅ ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)))) | |
| 2 | eldifsn 4758 | . . . 4 ⊢ (𝑥 ∈ (𝐴 ∖ {∅}) ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ≠ ∅)) | |
| 3 | 2 | anbi1i 635 | . . 3 ⊢ ((𝑥 ∈ (𝐴 ∖ {∅}) ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)) ↔ ((𝑥 ∈ 𝐴 ∧ 𝑥 ≠ ∅) ∧ (𝐵 ∈ 𝑥 ∧ 𝜑))) |
| 4 | ne0i 4302 | . . . . . . 7 ⊢ (𝐵 ∈ 𝑥 → 𝑥 ≠ ∅) | |
| 5 | 4 | pm4.71ri 569 | . . . . . 6 ⊢ (𝐵 ∈ 𝑥 ↔ (𝑥 ≠ ∅ ∧ 𝐵 ∈ 𝑥)) |
| 6 | 5 | anbi1i 635 | . . . . 5 ⊢ ((𝐵 ∈ 𝑥 ∧ 𝜑) ↔ ((𝑥 ≠ ∅ ∧ 𝐵 ∈ 𝑥) ∧ 𝜑)) |
| 7 | anass 473 | . . . . 5 ⊢ (((𝑥 ≠ ∅ ∧ 𝐵 ∈ 𝑥) ∧ 𝜑) ↔ (𝑥 ≠ ∅ ∧ (𝐵 ∈ 𝑥 ∧ 𝜑))) | |
| 8 | 6, 7 | bitri 278 | . . . 4 ⊢ ((𝐵 ∈ 𝑥 ∧ 𝜑) ↔ (𝑥 ≠ ∅ ∧ (𝐵 ∈ 𝑥 ∧ 𝜑))) |
| 9 | 8 | anbi2i 634 | . . 3 ⊢ ((𝑥 ∈ 𝐴 ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)) ↔ (𝑥 ∈ 𝐴 ∧ (𝑥 ≠ ∅ ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)))) |
| 10 | 1, 3, 9 | 3bitr4ri 307 | . 2 ⊢ ((𝑥 ∈ 𝐴 ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)) ↔ (𝑥 ∈ (𝐴 ∖ {∅}) ∧ (𝐵 ∈ 𝑥 ∧ 𝜑))) |
| 11 | 10 | rexbii2 3114 | 1 ⊢ (∃𝑥 ∈ 𝐴 (𝐵 ∈ 𝑥 ∧ 𝜑) ↔ ∃𝑥 ∈ (𝐴 ∖ {∅})(𝐵 ∈ 𝑥 ∧ 𝜑)) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 209 ∧ wa 400 ∈ wcel 2149 ≠ wne 2964 ∃wrex 3095 ∖ cdif 3910 ∅c0 4294 {csn 4594 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1570 df-fal 1580 df-ex 1807 df-sb 2098 df-clab 2748 df-cleq 2761 df-clel 2844 df-ne 2965 df-rex 3096 df-v 3465 df-dif 3916 df-nul 4295 df-sn 4595 |
| This theorem is referenced by: (None) |
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