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| Description: The number 4 is real. (Contributed by NM, 27-May-1999.) | 
| Ref | Expression | 
|---|---|
| 4re | ⊢ 4 ∈ ℝ | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | df-4 12332 | . 2 ⊢ 4 = (3 + 1) | |
| 2 | 3re 12347 | . . 3 ⊢ 3 ∈ ℝ | |
| 3 | 1re 11262 | . . 3 ⊢ 1 ∈ ℝ | |
| 4 | 2, 3 | readdcli 11277 | . 2 ⊢ (3 + 1) ∈ ℝ | 
| 5 | 1, 4 | eqeltri 2836 | 1 ⊢ 4 ∈ ℝ | 
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