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Definition df-fns 5762
Description: Define the function with domain relationship. (Contributed by SF, 9-Feb-2015.)
Assertion
Ref Expression
df-fns Fns = {f, a f Fn a}
Distinct variable group:   f,a

Detailed syntax breakdown of Definition df-fns
StepHypRef Expression
1 cfns 5761 . 2 class Fns
2 vf . . . . 5 setvar f
32cv 1641 . . . 4 class f
4 va . . . . 5 setvar a
54cv 1641 . . . 4 class a
63, 5wfn 4776 . . 3 wff f Fn a
76, 2, 4copab 4622 . 2 class {f, a f Fn a}
81, 7wceq 1642 1 wff Fns = {f, a f Fn a}
Colors of variables: wff setvar class
This definition is referenced by:  fnsex  5832  brfns  5833
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