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| Mirrors > Home > ILE Home > Th. List > eqeq1d | Unicode version | ||
| Description: Deduction from equality to equivalence of equalities. (Contributed by NM, 27-Dec-1993.) | 
| Ref | Expression | 
|---|---|
| eqeq1d.1 | 
 | 
| Ref | Expression | 
|---|---|
| eqeq1d | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | eqeq1d.1 | 
. 2
 | |
| 2 | eqeq1 2203 | 
. 2
 | |
| 3 | 1, 2 | syl 14 | 
1
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