Theorem elrestr 13280

Description: Sufficient condition for being an open set in a subspace. (Contributed by Jeff Hankins, 11-Jul-2009.) (Revised by Mario Carneiro, 15-Dec-2013.)

Assertion

Ref	Expression
elrestr	|- ( ( J e. V /\ S e. W /\ A e. J ) -> ( A i^i S ) e. ( J ↾t S ) )

Proof of Theorem elrestr

Dummy variable x is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2229	. . . 4 |- ( A i^i S ) = ( A i^i S )
2		ineq1 3398	. . . . 5 |- ( x = A -> ( x i^i S ) = ( A i^i S ) )
3	2	rspceeqv 2925	. . . 4 |- ( ( A e. J /\ ( A i^i S ) = ( A i^i S ) ) -> E. x e. J ( A i^i S ) = ( x i^i S ) )
4	1, 3	mpan2 425	. . 3 |- ( A e. J -> E. x e. J ( A i^i S ) = ( x i^i S ) )
5		elrest 13279	. . 3 |- ( ( J e. V /\ S e. W ) -> ( ( A i^i S ) e. ( J ↾t S ) <-> E. x e. J ( A i^i S ) = ( x i^i S ) ) )
6	4, 5	imbitrrid 156	. 2 |- ( ( J e. V /\ S e. W ) -> ( A e. J -> ( A i^i S ) e. ( J ↾t S ) ) )
7	6	3impia 1224	1 |- ( ( J e. V /\ S e. W /\ A e. J ) -> ( A i^i S ) e. ( J ↾t S ) )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 1002   = wceq 1395   e. wcel 2200   E.wrex 2509   i^i cin 3196  (class class class)co 6001   ↾_t crest 13272

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-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4199  ax-sep 4202  ax-pow 4258  ax-pr 4293  ax-un 4524  ax-setind 4629

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-iun 3967  df-br 4084  df-opab 4146  df-mpt 4147  df-id 4384  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-rn 4730  df-res 4731  df-ima 4732  df-iota 5278  df-fun 5320  df-fn 5321  df-f 5322  df-f1 5323  df-fo 5324  df-f1o 5325  df-fv 5326  df-ov 6004  df-oprab 6005  df-mpo 6006  df-rest 13274

This theorem is referenced by:  restbasg  14842  tgrest  14843  resttopon  14845  cnrest  14909  lmss  14920