Description: A subset of the generating set is also a subset of the generated sigma-algebra. (Contributed by Thierry Arnoux, 22-Sep-2017)
Ref | Expression | ||
---|---|---|---|
Assertion | sssigagen2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr | ||
2 | sssigagen | ||
3 | 2 | adantr | |
4 | 1 3 | sstrd |