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Mirrors > Home > MPE Home > Th. List > 4nn0 | Structured version Visualization version GIF version |
Description: 4 is a nonnegative integer. (Contributed by Mario Carneiro, 18-Feb-2014.) |
Ref | Expression |
---|---|
4nn0 | ⊢ 4 ∈ ℕ0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 4nn 11961 | . 2 ⊢ 4 ∈ ℕ | |
2 | 1 | nnnn0i 12146 | 1 ⊢ 4 ∈ ℕ0 |
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