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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 5147. (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 5791 | . 2 |
5 | 2 | cv 1341 | . . . . 5 |
6 | 5, 3 | wcel 2135 | . . . 4 |
7 | 6, 1 | wa 103 | . . 3 |
8 | 7, 2 | cio 5145 | . 2 |
9 | 4, 8 | wceq 1342 | 1 |
Colors of variables: wff set class |
This definition is referenced by: riotaeqdv 5793 riotabidv 5794 riotaexg 5796 riotav 5797 riotauni 5798 nfriota1 5799 nfriotadxy 5800 cbvriota 5802 riotacl2 5805 riotabidva 5808 riota1 5810 riota2df 5812 snriota 5821 riotaund 5826 bdcriota 13606 |
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