Description: Appending two sets to an indexed union. (Contributed by Thierry Arnoux, 20-Nov-2023)
Ref | Expression | ||
---|---|---|---|
Hypotheses | iunxunsn.1 | ||
iunxunpr.2 | |||
Assertion | iunxunpr |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iunxunsn.1 | ||
2 | iunxunpr.2 | ||
3 | iunxun | ||
4 | 1 2 | iunxprg | |
5 | 4 | uneq2d | |
6 | 3 5 | syl5eq |