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Mirrors > Home > MPE Home > Th. List > nnnn0 | Structured version Visualization version GIF version |
Description: A positive integer is a nonnegative integer. (Contributed by NM, 9-May-2004.) |
Ref | Expression |
---|---|
nnnn0 | ⊢ (𝐴 ∈ ℕ → 𝐴 ∈ ℕ0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnssnn0 12245 | . 2 ⊢ ℕ ⊆ ℕ0 | |
2 | 1 | sseli 3918 | 1 ⊢ (𝐴 ∈ ℕ → 𝐴 ∈ ℕ0) |
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