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Syntax Definition co 3954
Description: Extend class notation to include the value of an operation F (such as +) for two arguments A and B. Note that the syntax is simply three class symbols in a row surrounded by parentheses. Since operation values are the only possible class expressions consisting of three class expressions in a row surrounded by parentheses, the syntax is unambiguous. (For an example of how syntax could become ambiguous if we are not careful, see the comment in cneg 5273.)
Hypotheses
Ref Expression
cA class A
cB class B
cF class F
Assertion
Ref Expression
co class (AFB)
See definition df-opr 3956 for more information.
Colors of variables: wff set class
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