Description: The Cartesian product of two sets is a set. Proposition 6.2 of TakeutiZaring p. 23. See also xpexgALT . (Contributed by NM, 14-Aug-1994)
Ref | Expression | ||
---|---|---|---|
Assertion | xpexg | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xpsspw | |
|
2 | unexg | |
|
3 | pwexg | |
|
4 | pwexg | |
|
5 | 2 3 4 | 3syl | |
6 | ssexg | |
|
7 | 1 5 6 | sylancr | |