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Mirrors > Home > MPE Home > Th. List > n0 | Structured version Visualization version Unicode version |
Description: A nonempty class has at least one element. Proposition 5.17(1) of [TakeutiZaring] p. 20. (Contributed by NM, 29-Sep-2006.) |
Ref | Expression |
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n0 |
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Step | Hyp | Ref | Expression |
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1 | nfcv 2612 |
. 2
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2 | 1 | n0f 3731 |
1
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