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| Mirrors > Home > NFE 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 2362 | 
. 2
 | |
| 3 | 1, 2 | syl 15 | 
1
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