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| Mirrors > Home > ILE Home > Th. List > opexg | Unicode version | ||
| Description: An ordered pair of sets is a set. (Contributed by Jim Kingdon, 11-Jan-2019.) |
| Ref | Expression |
|---|---|
| opexg |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dfopg 3817 |
. 2
| |
| 2 | elex 2783 |
. . . . 5
| |
| 3 | snexg 4228 |
. . . . 5
| |
| 4 | 2, 3 | syl 14 |
. . . 4
|
| 5 | 4 | adantr 276 |
. . 3
|
| 6 | elex 2783 |
. . . 4
| |
| 7 | prexg 4255 |
. . . 4
| |
| 8 | 2, 6, 7 | syl2an 289 |
. . 3
|
| 9 | prexg 4255 |
. . 3
| |
| 10 | 5, 8, 9 | syl2anc 411 |
. 2
|
| 11 | 1, 10 | eqeltrd 2282 |
1
|
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