Theorem epini 4868

Description: Any set is equal to its preimage under the converse epsilon relation. (Contributed by Mario Carneiro, 9-Mar-2013.)

Hypothesis

Ref	Expression
epini.1	|- A e. _V

Assertion

Ref	Expression
epini	|- ( `' _E " { A } ) = A

Proof of Theorem epini

Dummy variable x is distinct from all other variables.

Step	Hyp	Ref	Expression
1		epini.1	. . . 4 |- A e. _V
2		vex 2660	. . . . 5 |- x e. _V
3	2	eliniseg 4867	. . . 4 |- ( A e. _V -> ( x e. ( `' _E " { A } ) <-> x _E A ) )
4	1, 3	ax-mp 7	. . 3 |- ( x e. ( `' _E " { A } ) <-> x _E A )
5	1	epelc 4173	. . 3 |- ( x _E A <-> x e. A )
6	4, 5	bitri 183	. 2 |- ( x e. ( `' _E " { A } ) <-> x e. A )
7	6	eqriv 2112	1 |- ( `' _E " { A } ) = A

Syntax hints:   <-> wb 104   = wceq 1314   e. wcel 1463   _Vcvv 2657   {csn 3493   class class class wbr 3895   _E cep 4169   `'ccnv 4498   "cima 4502

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-14 1475  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097  ax-sep 4006  ax-pow 4058  ax-pr 4091

This theorem depends on definitions:  df-bi 116  df-3an 947  df-tru 1317  df-nf 1420  df-sb 1719  df-eu 1978  df-mo 1979  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2244  df-ral 2395  df-rex 2396  df-v 2659  df-sbc 2879  df-un 3041  df-in 3043  df-ss 3050  df-pw 3478  df-sn 3499  df-pr 3500  df-op 3502  df-br 3896  df-opab 3950  df-eprel 4171  df-xp 4505  df-cnv 4507  df-dm 4509  df-rn 4510  df-res 4511  df-ima 4512

This theorem is referenced by: (None)