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Mirrors > Home > MPE Home > Th. List > rabn0 | Structured version Visualization version Unicode version |
Description: Nonempty restricted class abstraction. (Contributed by NM, 29-Aug-1999.) (Revised by BJ, 16-Jul-2021.) |
Ref | Expression |
---|---|
rabn0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rabeq0 3957 | . . 3 | |
2 | 1 | necon3abii 2840 | . 2 |
3 | dfrex2 2996 | . 2 | |
4 | 2, 3 | bitr4i 267 | 1 |
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