Description: Rearrange indexed unions over intersection. (Contributed by NM, 18-Dec-2008)
Ref | Expression | ||
---|---|---|---|
Assertion | 2iunin | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iunin2 | |
|
2 | 1 | a1i | |
3 | 2 | iuneq2i | |
4 | iunin1 | |
|
5 | 3 4 | eqtri | |