Description: TopSet is unaffected by restriction. (Contributed by Mario Carneiro, 13-Aug-2015)
Ref | Expression | ||
---|---|---|---|
Hypotheses | resstset.1 | ||
resstset.2 | |||
Assertion | resstset |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | resstset.1 | ||
2 | resstset.2 | ||
3 | df-tset | ||
4 | 9nn | ||
5 | 1lt9 | ||
6 | 1 2 3 4 5 | resslem |