Description: Utility theorem for the inverse of inftyexpi . (Contributed by BJ, 22-Jun-2019) This utility theorem is irrelevant and should generally not be used. (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | bj-inftyexpiinv | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | opeq1 | |
|
2 | df-bj-inftyexpi | |
|
3 | opex | |
|
4 | 1 2 3 | fvmpt | |
5 | 4 | fveq2d | |
6 | cnex | |
|
7 | op1stg | |
|
8 | 6 7 | mpan2 | |
9 | 5 8 | eqtrd | |