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| Mirrors > Home > ILE Home > Th. List > eleq1 | Unicode version | ||
| Description: Equality implies equivalence of membership. (Contributed by NM, 5-Aug-1993.) |
| Ref | Expression |
|---|---|
| eleq1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqeq2 2206 |
. . . 4
| |
| 2 | 1 | anbi1d 465 |
. . 3
|
| 3 | 2 | exbidv 1839 |
. 2
|
| 4 | df-clel 2192 |
. 2
| |
| 5 | df-clel 2192 |
. 2
| |
| 6 | 3, 4, 5 | 3bitr4g 223 |
1
|
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