Description: Functionality of the projection function. (Contributed by NM, 24-Apr-2006) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | pjmfn | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-hilex | |
|
2 | 1 | mptex | |
3 | df-pjh | |
|
4 | 2 3 | fnmpti | |