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| Mirrors > Home > MPE Home > Th. List > elin | Structured version Visualization version Unicode version | ||
| Description: Expansion of membership in an intersection of two classes. Theorem 12 of [Suppes] p. 25. (Contributed by NM, 29-Apr-1994.) |
| Ref | Expression |
|---|---|
| elin |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elex 3212 |
. 2
| |
| 2 | elex 3212 |
. . 3
| |
| 3 | 2 | adantl 482 |
. 2
|
| 4 | eleq1 2689 |
. . . 4
| |
| 5 | eleq1 2689 |
. . . 4
| |
| 6 | 4, 5 | anbi12d 747 |
. . 3
|
| 7 | df-in 3581 |
. . 3
| |
| 8 | 6, 7 | elab2g 3353 |
. 2
|
| 9 | 1, 3, 8 | pm5.21nii 368 |
1
|
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