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| Mirrors > Home > MPE Home > Th. List > eleq2d | Structured version Visualization version Unicode version | ||
| Description: Deduction from equality to equivalence of membership. (Contributed by NM, 27-Dec-1993.) Reduce dependencies on axioms. (Revised by Wolf Lammen, 5-Dec-2019.) |
| Ref | Expression |
|---|---|
| eleq1d.1 |
|
| Ref | Expression |
|---|---|
| eleq2d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1d.1 |
. . . 4
| |
| 2 | dfcleq 2616 |
. . . 4
| |
| 3 | 1, 2 | sylib 208 |
. . 3
|
| 4 | anbi2 744 |
. . . 4
| |
| 5 | 4 | alexbii 1760 |
. . 3
|
| 6 | 3, 5 | syl 17 |
. 2
|
| 7 | df-clel 2618 |
. 2
| |
| 8 | df-clel 2618 |
. 2
| |
| 9 | 6, 7, 8 | 3bitr4g 303 |
1
|
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