Description: Membership in class intersection. (Contributed by Glauco Siliprandi, 3-Jan-2021)
Ref | Expression | ||
---|---|---|---|
Hypotheses | elintd.1 | ||
elintd.2 | |||
elintd.3 | |||
Assertion | elintd |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elintd.1 | ||
2 | elintd.2 | ||
3 | elintd.3 | ||
4 | 3 | ex | |
5 | 1 4 | ralrimi | |
6 | elintg | ||
7 | 2 6 | syl | |
8 | 5 7 | mpbird |