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Mirrors > Home > MPE Home > Th. List > Mathboxes > elex2VD | Structured version Visualization version GIF version |
Description: Virtual deduction proof of elex2 2816. (Contributed by Alan Sare, 25-Sep-2011.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
elex2VD | ⊢ (𝐴 ∈ 𝐵 → ∃𝑥 𝑥 ∈ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | idn1 44572 | . . . . . 6 ⊢ ( 𝐴 ∈ 𝐵 ▶ 𝐴 ∈ 𝐵 ) | |
2 | idn2 44611 | . . . . . 6 ⊢ ( 𝐴 ∈ 𝐵 , 𝑥 = 𝐴 ▶ 𝑥 = 𝐴 ) | |
3 | eleq1a 2834 | . . . . . 6 ⊢ (𝐴 ∈ 𝐵 → (𝑥 = 𝐴 → 𝑥 ∈ 𝐵)) | |
4 | 1, 2, 3 | e12 44722 | . . . . 5 ⊢ ( 𝐴 ∈ 𝐵 , 𝑥 = 𝐴 ▶ 𝑥 ∈ 𝐵 ) |
5 | 4 | in2 44603 | . . . 4 ⊢ ( 𝐴 ∈ 𝐵 ▶ (𝑥 = 𝐴 → 𝑥 ∈ 𝐵) ) |
6 | 5 | gen11 44614 | . . 3 ⊢ ( 𝐴 ∈ 𝐵 ▶ ∀𝑥(𝑥 = 𝐴 → 𝑥 ∈ 𝐵) ) |
7 | elisset 2821 | . . . 4 ⊢ (𝐴 ∈ 𝐵 → ∃𝑥 𝑥 = 𝐴) | |
8 | 1, 7 | e1a 44625 | . . 3 ⊢ ( 𝐴 ∈ 𝐵 ▶ ∃𝑥 𝑥 = 𝐴 ) |
9 | exim 1831 | . . 3 ⊢ (∀𝑥(𝑥 = 𝐴 → 𝑥 ∈ 𝐵) → (∃𝑥 𝑥 = 𝐴 → ∃𝑥 𝑥 ∈ 𝐵)) | |
10 | 6, 8, 9 | e11 44686 | . 2 ⊢ ( 𝐴 ∈ 𝐵 ▶ ∃𝑥 𝑥 ∈ 𝐵 ) |
11 | 10 | in1 44569 | 1 ⊢ (𝐴 ∈ 𝐵 → ∃𝑥 𝑥 ∈ 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∀wal 1535 = wceq 1537 ∃wex 1776 ∈ wcel 2106 |
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 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-ext 2706 |
This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1540 df-ex 1777 df-sb 2063 df-clab 2713 df-cleq 2727 df-clel 2814 df-vd1 44568 df-vd2 44576 |
This theorem is referenced by: (None) |
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