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| Mirrors > Home > MPE Home > Th. List > xp2nd | Structured version Visualization version Unicode version | ||
| Description: Location of the second element of a Cartesian product. (Contributed by Jeff Madsen, 2-Sep-2009.) |
| Ref | Expression |
|---|---|
| xp2nd |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elxp 5131 |
. 2
| |
| 2 | vex 3203 |
. . . . . . 7
| |
| 3 | vex 3203 |
. . . . . . 7
| |
| 4 | 2, 3 | op2ndd 7179 |
. . . . . 6
|
| 5 | 4 | eleq1d 2686 |
. . . . 5
|
| 6 | 5 | biimpar 502 |
. . . 4
|
| 7 | 6 | adantrl 752 |
. . 3
|
| 8 | 7 | exlimivv 1860 |
. 2
|
| 9 | 1, 8 | sylbi 207 |
1
|
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