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Syntax Definition co 5792
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 9006.)
Hypotheses
Ref Expression
cA  class  A
cB  class  B
cF  class  F
Assertion
Ref Expression
co  class  ( A F B )

See definition df-ov 5795 for more information.

Colors of variables: wff set class
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