Description: Functionality of composition of projections. (Contributed by NM, 1-Oct-2000) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypotheses | pjco.1 | ||
pjco.2 | |||
Assertion | pjcofni |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pjco.1 | ||
2 | pjco.2 | ||
3 | 1 | pjfi | |
4 | 2 | pjfi | |
5 | 3 4 | hocofni |