Description: A one-to-one mapping is a function. (Contributed by NM, 8-Mar-2014)
Ref | Expression | ||
---|---|---|---|
Assertion | f1fun | |- ( F : A -1-1-> B -> Fun F ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | f1fn | |- ( F : A -1-1-> B -> F Fn A ) |
|
2 | fnfun | |- ( F Fn A -> Fun F ) |
|
3 | 1 2 | syl | |- ( F : A -1-1-> B -> Fun F ) |