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Mirrors > Home > MPE Home > Th. List > nnex | Structured version Visualization version Unicode version |
Description: The set of positive integers exists. (Contributed by NM, 3-Oct-1999.) (Revised by Mario Carneiro, 17-Nov-2014.) |
Ref | Expression |
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nnex |
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Step | Hyp | Ref | Expression |
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1 | cnex 10017 |
. 2
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2 | nnsscn 11025 |
. 2
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3 | 1, 2 | ssexi 4803 |
1
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