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Mirrors > Home > MPE Home > Th. List > elsn | Structured version Visualization version Unicode version |
Description: There is only one element in a singleton. Exercise 2 of [TakeutiZaring] p. 15. (Contributed by NM, 21-Jun-1993.) |
Ref | Expression |
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elsn |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-sn 3969 |
. 2
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2 | 1 | abeq2i 2563 |
1
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