Description: The converse of a mapping function. (Contributed by Thierry Arnoux, 16-Jan-2017)
Ref | Expression | ||
---|---|---|---|
Hypothesis | mptcnv.1 | |
|
Assertion | mptcnv | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mptcnv.1 | |
|
2 | 1 | opabbidv | |
3 | df-mpt | |
|
4 | 3 | cnveqi | |
5 | cnvopab | |
|
6 | 4 5 | eqtri | |
7 | df-mpt | |
|
8 | 2 6 7 | 3eqtr4g | |