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| Mirrors > Home > MPE Home > Th. List > nnex | Structured version Visualization version GIF version | ||
| Description: The set of positive integers exists. (Contributed by NM, 3-Oct-1999.) (Revised by Mario Carneiro, 17-Nov-2014.) |
| Ref | Expression |
|---|---|
| nnex | ⊢ ℕ ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnex 11236 | . 2 ⊢ ℂ ∈ V | |
| 2 | nnsscn 12271 | . 2 ⊢ ℕ ⊆ ℂ | |
| 3 | 1, 2 | ssexi 5322 | 1 ⊢ ℕ ∈ V |
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