Description: Relationship between the value of a one-to-one onto function and the value of its converse. (Contributed by Raph Levien, 10-Apr-2004)
Ref | Expression | ||
---|---|---|---|
Assertion | f1ocnvfv | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fveq2 | |
|
2 | 1 | eqcoms | |
3 | f1ocnvfv1 | |
|
4 | 3 | eqeq2d | |
5 | 2 4 | syl5ib | |