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Definition df-si 4728
Description: Define the singleton image of a class. (Contributed by SF, 5-Jan-2015.)
Assertion
Ref Expression
df-si SI
Distinct variable group:   ,,,,

Detailed syntax breakdown of Definition df-si
StepHypRef Expression
1 cA . . 3
21csi 4720 . 2 SI
3 vx . . . . . . . 8
43cv 1641 . . . . . . 7
5 vz . . . . . . . . 9
65cv 1641 . . . . . . . 8
76csn 3737 . . . . . . 7
84, 7wceq 1642 . . . . . 6
9 vy . . . . . . . 8
109cv 1641 . . . . . . 7
11 vw . . . . . . . . 9
1211cv 1641 . . . . . . . 8
1312csn 3737 . . . . . . 7
1410, 13wceq 1642 . . . . . 6
156, 12, 1wbr 4639 . . . . . 6
168, 14, 15w3a 934 . . . . 5
1716, 11wex 1541 . . . 4
1817, 5wex 1541 . . 3
1918, 3, 9copab 4622 . 2
202, 19wceq 1642 1 SI
Colors of variables: wff setvar class
This definition is referenced by:  dfsi2  4751  brsi  4761  brsnsi  5773
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