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Definition df-fv 4795
Description: Define the value of a function. (Contributed by SF, 5-Jan-2015.)
Assertion
Ref Expression
df-fv (FA) = (℩xAFx)
Distinct variable groups:   x,A   x,F

Detailed syntax breakdown of Definition df-fv
StepHypRef Expression
1 cA . . 3 class A
2 cF . . 3 class F
31, 2cfv 4781 . 2 class (FA)
4 vx . . . . 5 setvar x
54cv 1641 . . . 4 class x
61, 5, 2wbr 4639 . . 3 wff AFx
76, 4cio 4337 . 2 class (℩xAFx)
83, 7wceq 1642 1 wff (FA) = (℩xAFx)
Colors of variables: wff setvar class
This definition is referenced by:  fv2  5324  fvprc  5325  fveq1  5327  fveq2  5328  nffv  5334  csbfv12g  5336  fvex  5339  fvres  5342  tz6.12-1  5344  fvco2  5382
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