Users' Mathboxes Mathbox for BJ < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >   Mathboxes  >  bdunexb Unicode version

Theorem bdunexb 15412
Description: Bounded version of unexb 4473. (Contributed by BJ, 13-Nov-2019.) (Proof modification is discouraged.)
Hypotheses
Ref Expression
bdunex.bd1  |- BOUNDED  A
bdunex.bd2  |- BOUNDED  B
Assertion
Ref Expression
bdunexb  |-  ( ( A  e.  _V  /\  B  e.  _V )  <->  ( A  u.  B )  e.  _V )

Proof of Theorem bdunexb
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 uneq1 3306 . . . 4  |-  ( x  =  A  ->  (
x  u.  y )  =  ( A  u.  y ) )
21eleq1d 2262 . . 3  |-  ( x  =  A  ->  (
( x  u.  y
)  e.  _V  <->  ( A  u.  y )  e.  _V ) )
3 uneq2 3307 . . . 4  |-  ( y  =  B  ->  ( A  u.  y )  =  ( A  u.  B ) )
43eleq1d 2262 . . 3  |-  ( y  =  B  ->  (
( A  u.  y
)  e.  _V  <->  ( A  u.  B )  e.  _V ) )
5 vex 2763 . . . 4  |-  x  e. 
_V
6 vex 2763 . . . 4  |-  y  e. 
_V
75, 6bj-unex 15411 . . 3  |-  ( x  u.  y )  e. 
_V
82, 4, 7vtocl2g 2824 . 2  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  ( A  u.  B
)  e.  _V )
9 ssun1 3322 . . . 4  |-  A  C_  ( A  u.  B
)
10 bdunex.bd1 . . . . 5  |- BOUNDED  A
1110bdssexg 15396 . . . 4  |-  ( ( A  C_  ( A  u.  B )  /\  ( A  u.  B )  e.  _V )  ->  A  e.  _V )
129, 11mpan 424 . . 3  |-  ( ( A  u.  B )  e.  _V  ->  A  e.  _V )
13 ssun2 3323 . . . 4  |-  B  C_  ( A  u.  B
)
14 bdunex.bd2 . . . . 5  |- BOUNDED  B
1514bdssexg 15396 . . . 4  |-  ( ( B  C_  ( A  u.  B )  /\  ( A  u.  B )  e.  _V )  ->  B  e.  _V )
1613, 15mpan 424 . . 3  |-  ( ( A  u.  B )  e.  _V  ->  B  e.  _V )
1712, 16jca 306 . 2  |-  ( ( A  u.  B )  e.  _V  ->  ( A  e.  _V  /\  B  e.  _V ) )
188, 17impbii 126 1  |-  ( ( A  e.  _V  /\  B  e.  _V )  <->  ( A  u.  B )  e.  _V )
Colors of variables: wff set class
Syntax hints:    /\ wa 104    <-> wb 105    = wceq 1364    e. wcel 2164   _Vcvv 2760    u. cun 3151    C_ wss 3153  BOUNDED wbdc 15332
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 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-pr 4238  ax-un 4464  ax-bd0 15305  ax-bdor 15308  ax-bdex 15311  ax-bdeq 15312  ax-bdel 15313  ax-bdsb 15314  ax-bdsep 15376
This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-rex 2478  df-v 2762  df-un 3157  df-in 3159  df-ss 3166  df-sn 3624  df-pr 3625  df-uni 3836  df-bdc 15333
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator