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| Mirrors > Home > ILE Home > Th. List > eqeq2d | Unicode version | ||
| Description: Deduction from equality to equivalence of equalities. (Contributed by NM, 27-Dec-1993.) |
| Ref | Expression |
|---|---|
| eqeq2d.1 |
|
| Ref | Expression |
|---|---|
| eqeq2d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqeq2d.1 |
. 2
| |
| 2 | eqeq2 2206 |
. 2
| |
| 3 | 1, 2 | syl 14 |
1
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