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Theorem bdeqsuc 16597
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 16596 . . . 4  |- BOUNDED  suc  y
21bdss 16580 . . 3  |- BOUNDED  x  C_  suc  y
3 bdcv 16564 . . . . . . 7  |- BOUNDED  x
43bdss 16580 . . . . . 6  |- BOUNDED  y  C_  x
53bdsnss 16589 . . . . . 6  |- BOUNDED  { y }  C_  x
64, 5ax-bdan 16531 . . . . 5  |- BOUNDED  ( y  C_  x  /\  { y }  C_  x )
7 unss 3383 . . . . 5  |-  ( ( y  C_  x  /\  { y }  C_  x
)  <->  ( y  u. 
{ y } ) 
C_  x )
86, 7bd0 16540 . . . 4  |- BOUNDED  ( y  u.  {
y } )  C_  x
9 df-suc 4474 . . . . 5  |-  suc  y  =  ( y  u. 
{ y } )
109sseq1i 3254 . . . 4  |-  ( suc  y  C_  x  <->  ( y  u.  { y } ) 
C_  x )
118, 10bd0r 16541 . . 3  |- BOUNDED  suc  y  C_  x
122, 11ax-bdan 16531 . 2  |- BOUNDED  ( x  C_  suc  y  /\  suc  y  C_  x )
13 eqss 3243 . 2  |-  ( x  =  suc  y  <->  ( x  C_ 
suc  y  /\  suc  y  C_  x ) )
1412, 13bd0r 16541 1  |- BOUNDED  x  =  suc  y
Colors of variables: wff set class
Syntax hints:    /\ wa 104    = wceq 1398    u. cun 3199    C_ wss 3201   {csn 3673   suc csuc 4468  BOUNDED wbd 16528
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2213  ax-bd0 16529  ax-bdan 16531  ax-bdor 16532  ax-bdal 16534  ax-bdeq 16536  ax-bdel 16537  ax-bdsb 16538
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-sn 3679  df-suc 4474  df-bdc 16557
This theorem is referenced by:  bj-bdsucel  16598  bj-nn0suc0  16666
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