Description: The Borel sigma-algebra on the Reals. (Contributed by Glauco Siliprandi, 26-Jun-2021)
Ref | Expression | ||
---|---|---|---|
Hypotheses | bor1sal.t | ||
bor1sal.b | |||
Assertion | bor1sal |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bor1sal.t | ||
2 | bor1sal.b | ||
3 | retop | ||
4 | 1 3 | eqeltri | |
5 | 4 | a1i | |
6 | 5 2 | salgencld | |
7 | 6 | mptru |