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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 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | npsspw 7469 |
. . . 4
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2 | 1 | sseli 3151 |
. . 3
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3 | 1st2nd2 6175 |
. . 3
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4 | 2, 3 | syl 14 |
. 2
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5 | eleq1 2240 |
. . 3
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6 | 5 | biimpcd 159 |
. 2
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7 | 4, 6 | mpd 13 |
1
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