Description: Value of the image functor. (Contributed by Scott Fenton, 4-Apr-2014) (Revised by Mario Carneiro, 19-Apr-2014)
Ref | Expression | ||
---|---|---|---|
Assertion | fvimage | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex | |
|
2 | imaeq2 | |
|
3 | imageval | |
|
4 | 2 3 | fvmptg | |
5 | 1 4 | sylan | |