Description: Equality inference for composition of two classes. (Contributed by FL, 7-Jun-2012)
Ref | Expression | ||
---|---|---|---|
Hypotheses | coeq12i.1 | |
|
coeq12i.2 | |
||
Assertion | coeq12i | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | coeq12i.1 | |
|
2 | coeq12i.2 | |
|
3 | 1 | coeq1i | |
4 | 2 | coeq2i | |
5 | 3 4 | eqtri | |