Description: Relationship between two restricted universal and existential quantifiers. (Contributed by Glauco Siliprandi, 11-Dec-2019)
Ref | Expression | ||
---|---|---|---|
Assertion | rexnal2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rexnal | |
|
2 | 1 | rexbii | |
3 | rexnal | |
|
4 | 2 3 | bitri | |