Theorem opelresi 5040

Description: <. A , A >. belongs to a restriction of the identity class iff A belongs to the restricting class. (Contributed by FL, 27-Oct-2008.) (Revised by NM, 30-Mar-2016.)

Assertion

Ref	Expression
opelresi	|- ( A e. V -> ( <. A , A >. e. ( _I |` B ) <-> A e. B ) )

Proof of Theorem opelresi

Step	Hyp	Ref	Expression
1		opelresg 5036	. 2 |- ( A e. V -> ( <. A , A >. e. ( _I |` B ) <-> ( <. A , A >. e. _I /\ A e. B ) ) )
2		ididg 4899	. . . 4 |- ( A e. V -> A _I A )
3		df-br 4103	. . . 4 |- ( A _I A <-> <. A , A >. e. _I )
4	2, 3	sylib 122	. . 3 |- ( A e. V -> <. A , A >. e. _I )
5	4	biantrurd 305	. 2 |- ( A e. V -> ( A e. B <-> ( <. A , A >. e. _I /\ A e. B ) ) )
6	1, 5	bitr4d 191	1 |- ( A e. V -> ( <. A , A >. e. ( _I |` B ) <-> A e. B ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   e. wcel 2203   <.cop 3685   class class class wbr 4102   _I cid 4400   |` cres 4742

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2206  ax-ext 2214  ax-sep 4221  ax-pow 4279  ax-pr 4314

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2814  df-un 3214  df-in 3216  df-ss 3223  df-pw 3667  df-sn 3688  df-pr 3689  df-op 3691  df-br 4103  df-opab 4165  df-id 4405  df-xp 4746  df-rel 4747  df-res 4752

This theorem is referenced by:  issref  5136