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Mirrors > Home > NFE Home > Th. List > eleq1d | Unicode version |
Description: Deduction from equality to equivalence of membership. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
eleq1d.1 |
Ref | Expression |
---|---|
eleq1d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1d.1 | . 2 | |
2 | eleq1 2413 | . 2 | |
3 | 1, 2 | syl 15 | 1 |
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