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Syntax Definition wcdeq 2812
Description: Extend wff notation to include conditional equality. This is a technical device used in the proof that 
F/ is the not-free predicate, and that definitions are conservative as a result.
Hypotheses
Ref Expression
wph  wff  ph
vx  setvar  x
vy  setvar  y
Assertion
Ref Expression
wcdeq  wff CondEq ( x  =  y  ->  ph )

See definition df-cdeq 2813 for more information.

Colors of variables: wff set class
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