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| Mirrors > Home > MPE Home > Th. List > eqeq1d | Structured version Visualization version Unicode version | ||
| Description: Deduction from equality to equivalence of equalities. (Contributed by NM, 27-Dec-1993.) Reduce dependencies on axioms. (Revised by Wolf Lammen, 5-Dec-2019.) |
| Ref | Expression |
|---|---|
| eqeq1d.1 |
|
| Ref | Expression |
|---|---|
| eqeq1d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqeq1d.1 |
. . 3
| |
| 2 | dfcleq 2616 |
. . . 4
| |
| 3 | 2 | biimpi 206 |
. . 3
|
| 4 | bibi1 341 |
. . . 4
| |
| 5 | 4 | alimi 1739 |
. . 3
|
| 6 | albi 1746 |
. . 3
| |
| 7 | 1, 3, 5, 6 | 4syl 19 |
. 2
|
| 8 | dfcleq 2616 |
. 2
| |
| 9 | dfcleq 2616 |
. 2
| |
| 10 | 7, 8, 9 | 3bitr4g 303 |
1
|
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