Description: Equality theorem for the well-founded predicate. (Contributed by NM, 3-Apr-1994)
Ref | Expression | ||
---|---|---|---|
Assertion | freq2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqimss2 | |
|
2 | frss | |
|
3 | 1 2 | syl | |
4 | eqimss | |
|
5 | frss | |
|
6 | 4 5 | syl | |
7 | 3 6 | impbid | |