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Syntax Definition cafv 27839
Description: Extend the definition of a class to include the value of a function. (Read: The value of  F at  A, or " F of  A."). In a previous version, the symbol " ' " was used. However, since the similarity with the symbol 
` used for the current definition of a function's value (see df-fv 5421), which, by the way, was intended to visualize that in many cases  ` and " ' " are exchangeable, makes reading the theorems, especially those which uses both definitions as dfafv2 27863, very difficult, 3 apostrophes ''' are used now so that it's easier to distinguish from df-fv 5421 and df-ima 4850. And not three backticks ( three times  ` ) since that would be annoying to escape in a comment. (See remark of Norman Megill and Gerard Lang at!topic/metamath/cteNUppB6A4).
Ref Expression
cA  class  A
cF  class  F
Ref Expression
cafv  class  ( F''' A )

See definition df-afv 27842 for more information.

Colors of variables: wff set class
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