Description: Membership in a power class. (Contributed by Glauco Siliprandi, 3-Mar-2021) (Proof shortened by Wolf Lammen, 26-May-2024)
Ref | Expression | ||
---|---|---|---|
Hypotheses | elpwi2.1 | |
|
elpwi2.2 | |
||
Assertion | elpwi2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elpwi2.1 | |
|
2 | elpwi2.2 | |
|
3 | 1 | elexi | |
4 | 3 | elpw2 | |
5 | 2 4 | mpbir | |