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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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