Description: The power class of an intersection in terms of indexed intersection. Exercise 24(a) of Enderton p. 33. (Contributed by NM, 29-Nov-2003)
Ref | Expression | ||
---|---|---|---|
Assertion | iinpw | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssint | |
|
2 | velpw | |
|
3 | 2 | ralbii | |
4 | 1 3 | bitr4i | |
5 | velpw | |
|
6 | eliin | |
|
7 | 6 | elv | |
8 | 4 5 7 | 3bitr4i | |
9 | 8 | eqriv | |