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Mirrors > Home > NFE Home > Th. List > df-ref | Unicode version |
Description: Define the set of all reflexive relationships over a base set. (Contributed by SF, 19-Feb-2015.) |
Ref | Expression |
---|---|
df-ref | Ref |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cref 5889 | . 2 Ref | |
2 | vx | . . . . . 6 | |
3 | 2 | cv 1641 | . . . . 5 |
4 | vr | . . . . . 6 | |
5 | 4 | cv 1641 | . . . . 5 |
6 | 3, 3, 5 | wbr 4639 | . . . 4 |
7 | va | . . . . 5 | |
8 | 7 | cv 1641 | . . . 4 |
9 | 6, 2, 8 | wral 2614 | . . 3 |
10 | 9, 4, 7 | copab 4622 | . 2 |
11 | 1, 10 | wceq 1642 | 1 Ref |
Colors of variables: wff setvar class |
This definition is referenced by: refex 5911 refrd 5926 refd 5927 |
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