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Mirrors > Home > MPE Home > Th. List > snssi | Structured version Visualization version Unicode version |
Description: The singleton of an element of a class is a subset of the class. (Contributed by NM, 6-Jun-1994.) |
Ref | Expression |
---|---|
snssi |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snssg 4327 | . 2 | |
2 | 1 | ibi 256 | 1 |
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