Theorem opelresi 5072

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 5068	. 2 |- ( A e. V -> ( <. A , A >. e. ( _I |` B ) <-> ( <. A , A >. e. _I /\ A e. B ) ) )
2		ididg 4931	. . . 4 |- ( A e. V -> A _I A )
3		df-br 4129	. . . 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 2209   <.cop 3711   class class class wbr 4128   _I cid 4431   |` cres 4774

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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4247  ax-pow 4309  ax-pr 4344

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-br 4129  df-opab 4191  df-id 4436  df-xp 4778  df-rel 4779  df-res 4784

This theorem is referenced by:  issref  5168