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Theorem ordunisuc2r 4546
Description: An ordinal which contains the successor of each of its members is equal to its union. (Contributed by Jim Kingdon, 14-Nov-2018.)
Assertion
Ref Expression
ordunisuc2r  |-  ( Ord 
A  ->  ( A. x  e.  A  suc  x  e.  A  ->  A  =  U. A ) )
Distinct variable group:    x, A

Proof of Theorem ordunisuc2r
StepHypRef Expression
1 vex 2763 . . . . . . . . 9  |-  x  e. 
_V
21sucid 4448 . . . . . . . 8  |-  x  e. 
suc  x
3 elunii 3840 . . . . . . . 8  |-  ( ( x  e.  suc  x  /\  suc  x  e.  A
)  ->  x  e.  U. A )
42, 3mpan 424 . . . . . . 7  |-  ( suc  x  e.  A  ->  x  e.  U. A )
54imim2i 12 . . . . . 6  |-  ( ( x  e.  A  ->  suc  x  e.  A )  ->  ( x  e.  A  ->  x  e.  U. A ) )
65alimi 1466 . . . . 5  |-  ( A. x ( x  e.  A  ->  suc  x  e.  A )  ->  A. x
( x  e.  A  ->  x  e.  U. A
) )
7 df-ral 2477 . . . . 5  |-  ( A. x  e.  A  suc  x  e.  A  <->  A. x
( x  e.  A  ->  suc  x  e.  A
) )
8 dfss2 3168 . . . . 5  |-  ( A 
C_  U. A  <->  A. x
( x  e.  A  ->  x  e.  U. A
) )
96, 7, 83imtr4i 201 . . . 4  |-  ( A. x  e.  A  suc  x  e.  A  ->  A 
C_  U. A )
109a1i 9 . . 3  |-  ( Ord 
A  ->  ( A. x  e.  A  suc  x  e.  A  ->  A 
C_  U. A ) )
11 orduniss 4456 . . 3  |-  ( Ord 
A  ->  U. A  C_  A )
1210, 11jctird 317 . 2  |-  ( Ord 
A  ->  ( A. x  e.  A  suc  x  e.  A  ->  ( A  C_  U. A  /\  U. A  C_  A )
) )
13 eqss 3194 . 2  |-  ( A  =  U. A  <->  ( A  C_ 
U. A  /\  U. A  C_  A ) )
1412, 13imbitrrdi 162 1  |-  ( Ord 
A  ->  ( A. x  e.  A  suc  x  e.  A  ->  A  =  U. A ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104   A.wal 1362    = wceq 1364    e. wcel 2164   A.wral 2472    C_ wss 3153   U.cuni 3835   Ord word 4393   suc csuc 4396
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-ext 2175
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-ral 2477  df-v 2762  df-un 3157  df-in 3159  df-ss 3166  df-sn 3624  df-uni 3836  df-tr 4128  df-iord 4397  df-suc 4402
This theorem is referenced by: (None)
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