| Metamath Proof Explorer |
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Related theorems GIF version |
| Description: Extend the definition of a class to include the composition of two classes. (Read: The composition of A and B.) |
| Ref | Expression |
|---|---|
| cA | class A |
| cB | class B |
| Ref | Expression |
|---|---|
| ccom | class (A ∘ B) |
| Colors of variables: wff set class |