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Mirrors > Home > MPE Home > Th. List > nnne0 | Structured version Visualization version Unicode version |
Description: A positive integer is nonzero. (Contributed by NM, 27-Sep-1999.) |
Ref | Expression |
---|---|
nnne0 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0nnn 10674 |
. . 3
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2 | eleq1 2528 |
. . 3
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3 | 1, 2 | mtbiri 309 |
. 2
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4 | 3 | necon2ai 2665 |
1
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