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Mirrors > Home > MPE Home > Th. List > 2cn | Structured version Visualization version GIF version |
Description: The number 2 is a complex number. (Contributed by NM, 30-Jul-2004.) Reduce dependencies on axioms. (Revised by Steven Nguyen, 4-Oct-2022.) |
Ref | Expression |
---|---|
2cn | ⊢ 2 ∈ ℂ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-2 11779 | . 2 ⊢ 2 = (1 + 1) | |
2 | ax-1cn 10673 | . . 3 ⊢ 1 ∈ ℂ | |
3 | 2, 2 | addcli 10725 | . 2 ⊢ (1 + 1) ∈ ℂ |
4 | 1, 3 | eqeltri 2829 | 1 ⊢ 2 ∈ ℂ |
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