Description: A positive integer is a complex number. (Contributed by Mario Carneiro, 27-May-2016)
Ref | Expression | ||
---|---|---|---|
Hypothesis | nnred.1 | ⊢ ( 𝜑 → 𝐴 ∈ ℕ ) | |
Assertion | nncnd | ⊢ ( 𝜑 → 𝐴 ∈ ℂ ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnred.1 | ⊢ ( 𝜑 → 𝐴 ∈ ℕ ) | |
2 | nnsscn | ⊢ ℕ ⊆ ℂ | |
3 | 2 1 | sseldi | ⊢ ( 𝜑 → 𝐴 ∈ ℂ ) |