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Definition df-ssetk 4193
Description: Define the Kuratowski subset relationship. (Contributed by SF, 12-Jan-2015.)
Assertion
Ref Expression
df-ssetk Sk
Distinct variable group:   ,,

Detailed syntax breakdown of Definition df-ssetk
StepHypRef Expression
1 cssetk 4183 . 2 Sk
2 vx . . . . . . . 8
32cv 1641 . . . . . . 7
4 vy . . . . . . . . 9
54cv 1641 . . . . . . . 8
6 vz . . . . . . . . 9
76cv 1641 . . . . . . . 8
85, 7copk 4057 . . . . . . 7
93, 8wceq 1642 . . . . . 6
105, 7wss 3257 . . . . . 6
119, 10wa 358 . . . . 5
1211, 6wex 1541 . . . 4
1312, 4wex 1541 . . 3
1413, 2cab 2339 . 2
151, 14wceq 1642 1 Sk
Colors of variables: wff setvar class
This definition is referenced by:  opkelssetkg  4268  ssetkssvvk  4278
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