Description: Restriction of the mapping operation. (Contributed by Mario Carneiro, 17-Dec-2013)
Ref | Expression | ||
---|---|---|---|
Assertion | resmpo | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | resoprab2 | |
|
2 | df-mpo | |
|
3 | 2 | reseq1i | |
4 | df-mpo | |
|
5 | 1 3 4 | 3eqtr4g | |