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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 10883 | . 2 ⊢ ℂ ∈ V | |
2 | nnsscn 11908 | . 2 ⊢ ℕ ⊆ ℂ | |
3 | 1, 2 | ssexi 5241 | 1 ⊢ ℕ ∈ V |
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