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| Description: The number 3 is nonzero. (Contributed by FL, 17-Oct-2010.) (Proof shortened by Andrew Salmon, 7-May-2011.) | 
| Ref | Expression | 
|---|---|
| 3ne0 | ⊢ 3 ≠ 0 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | 3nn 12346 | . 2 ⊢ 3 ∈ ℕ | |
| 2 | 1 | nnne0i 12307 | 1 ⊢ 3 ≠ 0 | 
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