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Mirrors > Home > ILE Home > Th. List > eleq1w | Unicode version |
Description: Weaker version of eleq1 2228 (but more general than elequ1 2140) not depending on ax-ext 2147 nor df-cleq 2158. (Contributed by BJ, 24-Jun-2019.) |
Ref | Expression |
---|---|
eleq1w |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | equequ2 1701 | . . . 4 | |
2 | 1 | anbi1d 461 | . . 3 |
3 | 2 | exbidv 1813 | . 2 |
4 | df-clel 2161 | . 2 | |
5 | df-clel 2161 | . 2 | |
6 | 3, 4, 5 | 3bitr4g 222 | 1 |
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