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| Mirrors > Home > MPE Home > Th. List > eleq1d | Structured version Visualization version Unicode version | ||
| Description: Deduction from equality to equivalence of membership. (Contributed by NM, 21-Jun-1993.) Allow shortening of eleq1 2689. (Revised by Wolf Lammen, 20-Nov-2019.) |
| Ref | Expression |
|---|---|
| eleq1d.1 |
|
| Ref | Expression |
|---|---|
| eleq1d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1d.1 |
. . . . 5
| |
| 2 | 1 | eqeq2d 2632 |
. . . 4
|
| 3 | 2 | anbi1d 741 |
. . 3
|
| 4 | 3 | exbidv 1850 |
. 2
|
| 5 | df-clel 2618 |
. 2
| |
| 6 | df-clel 2618 |
. 2
| |
| 7 | 4, 5, 6 | 3bitr4g 303 |
1
|
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