Description: The Borel Algebra is a set of subsets of the real numbers. (Contributed by Thierry Arnoux, 19-Jan-2017)
Ref | Expression | ||
---|---|---|---|
Assertion | brsigasspwrn | |- BrSiga C_ ~P RR |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | brsigarn | |- BrSiga e. ( sigAlgebra ` RR ) |
|
2 | sigasspw | |- ( BrSiga e. ( sigAlgebra ` RR ) -> BrSiga C_ ~P RR ) |
|
3 | 1 2 | ax-mp | |- BrSiga C_ ~P RR |