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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 38831. (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 468 | . . 3 ⊢ (((𝑥 ∈ 𝐴 ∧ 𝑥 ≠ ∅) ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)) ↔ (𝑥 ∈ 𝐴 ∧ (𝑥 ≠ ∅ ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)))) | |
2 | eldifsn 4811 | . . . 4 ⊢ (𝑥 ∈ (𝐴 ∖ {∅}) ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ≠ ∅)) | |
3 | 2 | anbi1i 623 | . . 3 ⊢ ((𝑥 ∈ (𝐴 ∖ {∅}) ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)) ↔ ((𝑥 ∈ 𝐴 ∧ 𝑥 ≠ ∅) ∧ (𝐵 ∈ 𝑥 ∧ 𝜑))) |
4 | ne0i 4364 | . . . . . . 7 ⊢ (𝐵 ∈ 𝑥 → 𝑥 ≠ ∅) | |
5 | 4 | pm4.71ri 560 | . . . . . 6 ⊢ (𝐵 ∈ 𝑥 ↔ (𝑥 ≠ ∅ ∧ 𝐵 ∈ 𝑥)) |
6 | 5 | anbi1i 623 | . . . . 5 ⊢ ((𝐵 ∈ 𝑥 ∧ 𝜑) ↔ ((𝑥 ≠ ∅ ∧ 𝐵 ∈ 𝑥) ∧ 𝜑)) |
7 | anass 468 | . . . . 5 ⊢ (((𝑥 ≠ ∅ ∧ 𝐵 ∈ 𝑥) ∧ 𝜑) ↔ (𝑥 ≠ ∅ ∧ (𝐵 ∈ 𝑥 ∧ 𝜑))) | |
8 | 6, 7 | bitri 275 | . . . 4 ⊢ ((𝐵 ∈ 𝑥 ∧ 𝜑) ↔ (𝑥 ≠ ∅ ∧ (𝐵 ∈ 𝑥 ∧ 𝜑))) |
9 | 8 | anbi2i 622 | . . 3 ⊢ ((𝑥 ∈ 𝐴 ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)) ↔ (𝑥 ∈ 𝐴 ∧ (𝑥 ≠ ∅ ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)))) |
10 | 1, 3, 9 | 3bitr4ri 304 | . 2 ⊢ ((𝑥 ∈ 𝐴 ∧ (𝐵 ∈ 𝑥 ∧ 𝜑)) ↔ (𝑥 ∈ (𝐴 ∖ {∅}) ∧ (𝐵 ∈ 𝑥 ∧ 𝜑))) |
11 | 10 | rexbii2 3096 | 1 ⊢ (∃𝑥 ∈ 𝐴 (𝐵 ∈ 𝑥 ∧ 𝜑) ↔ ∃𝑥 ∈ (𝐴 ∖ {∅})(𝐵 ∈ 𝑥 ∧ 𝜑)) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 206 ∧ wa 395 ∈ wcel 2108 ≠ wne 2946 ∃wrex 3076 ∖ cdif 3973 ∅c0 4352 {csn 4648 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-ext 2711 |
This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1540 df-fal 1550 df-ex 1778 df-sb 2065 df-clab 2718 df-cleq 2732 df-clel 2819 df-ne 2947 df-rex 3077 df-v 3490 df-dif 3979 df-nul 4353 df-sn 4649 |
This theorem is referenced by: (None) |
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