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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 |
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eqeq2d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqeq2d.1 | . 2 | |
2 | eqeq2 2167 | . 2 | |
3 | 1, 2 | syl 14 | 1 |
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