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Mirrors > Home > MPE Home > Th. List > Mathboxes > amosym1 | Structured version Visualization version GIF version |
Description: A symmetry with ∃*.
See negsym1 33758 for more information. (Contributed by Anthony Hart, 13-Sep-2011.) |
Ref | Expression |
---|---|
amosym1 | ⊢ (∃*𝑥∃*𝑥⊥ → ∃*𝑥𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | moeu 2662 | . 2 ⊢ (∃*𝑥∃*𝑥⊥ ↔ (∃𝑥∃*𝑥⊥ → ∃!𝑥∃*𝑥⊥)) | |
2 | mofal 33750 | . . . . 5 ⊢ ∃*𝑥⊥ | |
3 | 19.8a 2173 | . . . . . 6 ⊢ (∃*𝑥⊥ → ∃𝑥∃*𝑥⊥) | |
4 | 3 | notnotd 146 | . . . . 5 ⊢ (∃*𝑥⊥ → ¬ ¬ ∃𝑥∃*𝑥⊥) |
5 | 2, 4 | ax-mp 5 | . . . 4 ⊢ ¬ ¬ ∃𝑥∃*𝑥⊥ |
6 | 5 | pm2.21i 119 | . . 3 ⊢ (¬ ∃𝑥∃*𝑥⊥ → ∃*𝑥𝜑) |
7 | 2 | notnoti 145 | . . . . . 6 ⊢ ¬ ¬ ∃*𝑥⊥ |
8 | 7 | nex 1795 | . . . . 5 ⊢ ¬ ∃𝑥 ¬ ∃*𝑥⊥ |
9 | eunex 5281 | . . . . 5 ⊢ (∃!𝑥∃*𝑥⊥ → ∃𝑥 ¬ ∃*𝑥⊥) | |
10 | 8, 9 | mto 199 | . . . 4 ⊢ ¬ ∃!𝑥∃*𝑥⊥ |
11 | 10 | pm2.21i 119 | . . 3 ⊢ (∃!𝑥∃*𝑥⊥ → ∃*𝑥𝜑) |
12 | 6, 11 | ja 188 | . 2 ⊢ ((∃𝑥∃*𝑥⊥ → ∃!𝑥∃*𝑥⊥) → ∃*𝑥𝜑) |
13 | 1, 12 | sylbi 219 | 1 ⊢ (∃*𝑥∃*𝑥⊥ → ∃*𝑥𝜑) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ⊥wfal 1543 ∃wex 1774 ∃*wmo 2614 ∃!weu 2647 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1905 ax-6 1964 ax-7 2009 ax-8 2110 ax-9 2118 ax-10 2139 ax-12 2170 ax-nul 5201 ax-pow 5257 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1534 df-fal 1544 df-ex 1775 df-nf 1779 df-mo 2616 df-eu 2648 |
This theorem is referenced by: (None) |
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