Description: Indexed union with a class difference as its index. (Contributed by NM, 10-Dec-2004)
Ref | Expression | ||
---|---|---|---|
Hypothesis | iunxdif2.1 | |
|
Assertion | iunxdif2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iunxdif2.1 | |
|
2 | iunss2 | |
|
3 | difss | |
|
4 | iunss1 | |
|
5 | 3 4 | ax-mp | |
6 | 1 | cbviunv | |
7 | 5 6 | sseqtrri | |
8 | 2 7 | jctil | |
9 | eqss | |
|
10 | 8 9 | sylibr | |