Description: Two ways to say that intersections with Cartesian products are in a subclass relation, special case of inxpss2 . (Contributed by Peter Mazsa, 6-Mar-2019)
Ref | Expression | ||
---|---|---|---|
Assertion | idinxpssinxp |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | inxpss2 | ||
2 | ideqg | ||
3 | 2 | elv | |
4 | 3 | imbi1i | |
5 | 4 | 2ralbii | |
6 | 1 5 | bitri |