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Theorem bdeqsuc 10672
Description: Boundedness of the formula expressing that a setvar is equal to the successor of another. (Contributed by BJ, 21-Nov-2019.)
Assertion
Ref Expression
bdeqsuc  |- BOUNDED  x  =  suc  y
Distinct variable group:    x, y

Proof of Theorem bdeqsuc
StepHypRef Expression
1 bdcsuc 10671 . . . 4  |- BOUNDED  suc  y
21bdss 10655 . . 3  |- BOUNDED  x  C_  suc  y
3 bdcv 10639 . . . . . . 7  |- BOUNDED  x
43bdss 10655 . . . . . 6  |- BOUNDED  y  C_  x
53bdsnss 10664 . . . . . 6  |- BOUNDED  { y }  C_  x
64, 5ax-bdan 10606 . . . . 5  |- BOUNDED  ( y  C_  x  /\  { y }  C_  x )
7 unss 3146 . . . . 5  |-  ( ( y  C_  x  /\  { y }  C_  x
)  <->  ( y  u. 
{ y } ) 
C_  x )
86, 7bd0 10615 . . . 4  |- BOUNDED  ( y  u.  {
y } )  C_  x
9 df-suc 4126 . . . . 5  |-  suc  y  =  ( y  u. 
{ y } )
109sseq1i 3023 . . . 4  |-  ( suc  y  C_  x  <->  ( y  u.  { y } ) 
C_  x )
118, 10bd0r 10616 . . 3  |- BOUNDED  suc  y  C_  x
122, 11ax-bdan 10606 . 2  |- BOUNDED  ( x  C_  suc  y  /\  suc  y  C_  x )
13 eqss 3014 . 2  |-  ( x  =  suc  y  <->  ( x  C_ 
suc  y  /\  suc  y  C_  x ) )
1412, 13bd0r 10616 1  |- BOUNDED  x  =  suc  y
Colors of variables: wff set class
Syntax hints:    /\ wa 102    = wceq 1284    u. cun 2971    C_ wss 2973   {csn 3398   suc csuc 4120  BOUNDED wbd 10603
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-bd0 10604  ax-bdan 10606  ax-bdor 10607  ax-bdal 10609  ax-bdeq 10611  ax-bdel 10612  ax-bdsb 10613
This theorem depends on definitions:  df-bi 115  df-tru 1287  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ral 2353  df-v 2603  df-un 2977  df-in 2979  df-ss 2986  df-sn 3404  df-suc 4126  df-bdc 10632
This theorem is referenced by:  bj-bdsucel  10673  bj-nn0suc0  10745
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