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Mirrors > Home > MPE Home > Th. List > 1ex | Structured version Visualization version Unicode version |
Description: 1 is a set. Common special case. (Contributed by David A. Wheeler, 7-Jul-2016.) |
Ref | Expression |
---|---|
1ex |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-1cn 9994 | . 2 | |
2 | 1 | elexi 3213 | 1 |
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