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| Mirrors > Home > ILE Home > Th. List > eleq1w | Unicode version | ||
| Description: Weaker version of eleq1 2259 (but more general than elequ1 2171) not depending on ax-ext 2178 nor df-cleq 2189. (Contributed by BJ, 24-Jun-2019.) | 
| Ref | Expression | 
|---|---|
| eleq1w | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | equequ2 1727 | 
. . . 4
 | |
| 2 | 1 | anbi1d 465 | 
. . 3
 | 
| 3 | 2 | exbidv 1839 | 
. 2
 | 
| 4 | df-clel 2192 | 
. 2
 | |
| 5 | df-clel 2192 | 
. 2
 | |
| 6 | 3, 4, 5 | 3bitr4g 223 | 
1
 | 
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