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Mirrors > Home > ILE Home > Th. List > df-riota | Unicode version |
Description: Define restricted description binder. In case there is no unique such that holds, it evaluates to the empty set. See also comments for df-iota 5058. (Contributed by NM, 15-Sep-2011.) (Revised by Mario Carneiro, 15-Oct-2016.) (Revised by NM, 2-Sep-2018.) |
Ref | Expression |
---|---|
df-riota |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wph | . . 3 | |
2 | vx | . . 3 | |
3 | cA | . . 3 | |
4 | 1, 2, 3 | crio 5697 | . 2 |
5 | 2 | cv 1315 | . . . . 5 |
6 | 5, 3 | wcel 1465 | . . . 4 |
7 | 6, 1 | wa 103 | . . 3 |
8 | 7, 2 | cio 5056 | . 2 |
9 | 4, 8 | wceq 1316 | 1 |
Colors of variables: wff set class |
This definition is referenced by: riotaeqdv 5699 riotabidv 5700 riotaexg 5702 riotav 5703 riotauni 5704 nfriota1 5705 nfriotadxy 5706 cbvriota 5708 riotacl2 5711 riotabidva 5714 riota1 5716 riota2df 5718 snriota 5727 riotaund 5732 bdcriota 12977 |
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