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Mirrors > Home > ILE Home > Th. List > prop | Unicode version |
Description: A positive real is an ordered pair of a lower cut and an upper cut. (Contributed by Jim Kingdon, 27-Sep-2019.) |
Ref | Expression |
---|---|
prop |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | npsspw 7433 | . . . 4 | |
2 | 1 | sseli 3143 | . . 3 |
3 | 1st2nd2 6154 | . . 3 | |
4 | 2, 3 | syl 14 | . 2 |
5 | eleq1 2233 | . . 3 | |
6 | 5 | biimpcd 158 | . 2 |
7 | 4, 6 | mpd 13 | 1 |
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