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| Mirrors > Home > MPE Home > Th. List > 4cn | Structured version Visualization version GIF version | ||
| Description: The number 4 is a complex number. (Contributed by David A. Wheeler, 7-Jul-2016.) Reduce dependencies on axioms. (Revised by Steven Nguyen, 4-Oct-2022.) |
| Ref | Expression |
|---|---|
| 4cn | ⊢ 4 ∈ ℂ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-4 12332 | . 2 ⊢ 4 = (3 + 1) | |
| 2 | 3cn 12348 | . . 3 ⊢ 3 ∈ ℂ | |
| 3 | ax-1cn 11214 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11268 | . 2 ⊢ (3 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2836 | 1 ⊢ 4 ∈ ℂ |
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