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Definition df-eprel 4764
Description: Define the epsilon relation. Similar to Definition 6.22 of [TakeutiZaring] p. 30. (Contributed by SF, 5-Jan-2015.)
Assertion
Ref Expression
df-eprel E = {x, y x y}
Distinct variable group:   x,y

Detailed syntax breakdown of Definition df-eprel
StepHypRef Expression
1 cep 4762 . 2 class E
2 vx . . . 4 setvar x
3 vy . . . 4 setvar y
42, 3wel 1711 . . 3 wff x y
54, 2, 3copab 4622 . 2 class {x, y x y}
61, 5wceq 1642 1 wff E = {x, y x y}
Colors of variables: wff setvar class
This definition is referenced by:  epelc  4765
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