Description: Define the subset class. For the value, see brsset . (Contributed by Scott Fenton, 31-Mar-2012)
Ref | Expression | ||
---|---|---|---|
Assertion | df-sset | |
Step | Hyp | Ref | Expression |
---|---|---|---|
0 | csset | |
|
1 | cvv | |
|
2 | 1 1 | cxp | |
3 | cep | |
|
4 | 1 3 | cdif | |
5 | 3 4 | ctxp | |
6 | 5 | crn | |
7 | 2 6 | cdif | |
8 | 0 7 | wceq | |