Description: A morphism of sets is a function. (Contributed by Mario Carneiro, 3-Jan-2017)
Ref | Expression | ||
---|---|---|---|
Hypotheses | setcbas.c | |
|
setcbas.u | |
||
setchomfval.h | |
||
setchom.x | |
||
setchom.y | |
||
Assertion | elsetchom | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | setcbas.c | |
|
2 | setcbas.u | |
|
3 | setchomfval.h | |
|
4 | setchom.x | |
|
5 | setchom.y | |
|
6 | 1 2 3 4 5 | setchom | |
7 | 6 | eleq2d | |
8 | 5 4 | elmapd | |
9 | 7 8 | bitrd | |