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| Description: Example for df-or 848. Example by David A. Wheeler. (Contributed by Mario Carneiro, 9-May-2015.) | 
| Ref | Expression | 
|---|---|
| ex-or | ⊢ (2 = 3 ∨ 4 = 4) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | eqid 2736 | . 2 ⊢ 4 = 4 | |
| 2 | 1 | olci 866 | 1 ⊢ (2 = 3 ∨ 4 = 4) | 
| Colors of variables: wff setvar class | 
| Syntax hints: ∨ wo 847 = wceq 1539 2c2 12322 3c3 12323 4c4 12324 | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 ax-5 1909 ax-6 1966 ax-7 2006 ax-9 2117 ax-ext 2707 | 
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-ex 1779 df-cleq 2728 | 
| This theorem is referenced by: (None) | 
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