Description: The binary product of categories is a two-argument function. (Contributed by Mario Carneiro, 10-Jan-2017)
Ref | Expression | ||
---|---|---|---|
Assertion | fnxpc | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-xpc | |
|
2 | tpex | |
|
3 | 2 | csbex | |
4 | 3 | csbex | |
5 | 1 4 | fnmpoi | |