Description: A Cartesian product expressed as indexed union of ordered-pair class abstractions. (Contributed by AV, 27-Jan-2020)
Ref | Expression | ||
---|---|---|---|
Assertion | xpiun |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xpsnopab | ||
2 | 1 | eqcomi | |
3 | 2 | a1i | |
4 | 3 | iuneq2i | |
5 | iunxpconst | ||
6 | 4 5 | eqtr2i |