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| Mirrors > Home > ILE Home > Th. List > ax-1cn | GIF version | ||
| Description: 1 is a complex number. Axiom for real and complex numbers, justified by Theorem ax1cn 7928. (Contributed by NM, 1-Mar-1995.) | 
| Ref | Expression | 
|---|---|
| ax-1cn | ⊢ 1 ∈ ℂ | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | c1 7880 | . 2 class 1 | |
| 2 | cc 7877 | . 2 class ℂ | |
| 3 | 1, 2 | wcel 2167 | 1 wff 1 ∈ ℂ | 
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