Description: Closure of composition of projections. (Contributed by NM, 7-Oct-2000) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypotheses | pjco.1 | |
|
pjco.2 | |
||
Assertion | pjcohcli | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pjco.1 | |
|
2 | pjco.2 | |
|
3 | 1 | pjfi | |
4 | 2 | pjfi | |
5 | 3 4 | hococli | |