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Metamath Proof Explorer

Theorem 6nn0

Description: 6 is a nonnegative integer. (Contributed by Mario Carneiro, 19-Apr-2015)

Ref Expression
Assertion 6nn0 6 ∈ ℕ0

Proof

Step Hyp Ref Expression
1 6nn ⊢ 6 ∈ ℕ
2 1 nnnn0i ⊢ 6 ∈ ℕ0