Description: The sigma-algebra generated by a collection A is a sigma-algebra on U. A . (Contributed by Thierry Arnoux, 27-Dec-2016)
Ref | Expression | ||
---|---|---|---|
Assertion | unisg | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sigagensiga | |
|
2 | issgon | |
|
3 | 1 2 | sylib | |
4 | 3 | simprd | |
5 | 4 | eqcomd | |