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Theorem elrestr 12564
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.  ( Jt  S ) )

Proof of Theorem elrestr
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 eqid 2165 . . . 4  |-  ( A  i^i  S )  =  ( A  i^i  S
)
2 ineq1 3316 . . . . 5  |-  ( x  =  A  ->  (
x  i^i  S )  =  ( A  i^i  S ) )
32rspceeqv 2848 . . . 4  |-  ( ( A  e.  J  /\  ( A  i^i  S )  =  ( A  i^i  S ) )  ->  E. x  e.  J  ( A  i^i  S )  =  ( x  i^i  S ) )
41, 3mpan2 422 . . 3  |-  ( A  e.  J  ->  E. x  e.  J  ( A  i^i  S )  =  ( x  i^i  S ) )
5 elrest 12563 . . 3  |-  ( ( J  e.  V  /\  S  e.  W )  ->  ( ( A  i^i  S )  e.  ( Jt  S )  <->  E. x  e.  J  ( A  i^i  S )  =  ( x  i^i 
S ) ) )
64, 5syl5ibr 155 . 2  |-  ( ( J  e.  V  /\  S  e.  W )  ->  ( A  e.  J  ->  ( A  i^i  S
)  e.  ( Jt  S ) ) )
763impia 1190 1  |-  ( ( J  e.  V  /\  S  e.  W  /\  A  e.  J )  ->  ( A  i^i  S
)  e.  ( Jt  S ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    /\ w3a 968    = wceq 1343    e. wcel 2136   E.wrex 2445    i^i cin 3115  (class class class)co 5842   ↾t crest 12556
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514
This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-ral 2449  df-rex 2450  df-reu 2451  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-id 4271  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-ov 5845  df-oprab 5846  df-mpo 5847  df-rest 12558
This theorem is referenced by:  restbasg  12808  tgrest  12809  resttopon  12811  cnrest  12875  lmss  12886
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