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| 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 7538 |
. . . 4
| |
| 2 | 1 | sseli 3179 |
. . 3
|
| 3 | 1st2nd2 6233 |
. . 3
| |
| 4 | 2, 3 | syl 14 |
. 2
|
| 5 | eleq1 2259 |
. . 3
| |
| 6 | 5 | biimpcd 159 |
. 2
|
| 7 | 4, 6 | mpd 13 |
1
|
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