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Metamath Proof Explorer

Theorem nncn

Description: A positive integer is a complex number. (Contributed by NM, 18-Aug-1999)

Ref Expression
Assertion nncn ( 𝐴 ∈ ℕ → 𝐴 ∈ ℂ )

Proof

Step Hyp Ref Expression
1 nnsscn ⊢ ℕ ⊆ ℂ
2 1 sseli ⊢ ( 𝐴 ∈ ℕ → 𝐴 ∈ ℂ )