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Related theorems Unicode version |
| Description: Equality implies equivalence of membership. |
| Ref | Expression |
|---|---|
| eleq2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dfcleq 1878 |
. . . . . 6
| |
| 2 | 1 | biimpi 168 |
. . . . 5
|
| 3 | 2 | 19.21bi 1408 |
. . . 4
|
| 4 | 3 | anbi2d 678 |
. . 3
|
| 5 | 4 | exbidv 1657 |
. 2
|
| 6 | df-clel 1880 |
. 2
| |
| 7 | df-clel 1880 |
. 2
| |
| 8 | 5, 6, 7 | 3bitr4g 614 |
1
|