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Theorem bdeqsuc 16412
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 16411 . . . 4  |- BOUNDED  suc  y
21bdss 16395 . . 3  |- BOUNDED  x  C_  suc  y
3 bdcv 16379 . . . . . . 7  |- BOUNDED  x
43bdss 16395 . . . . . 6  |- BOUNDED  y  C_  x
53bdsnss 16404 . . . . . 6  |- BOUNDED  { y }  C_  x
64, 5ax-bdan 16346 . . . . 5  |- BOUNDED  ( y  C_  x  /\  { y }  C_  x )
7 unss 3379 . . . . 5  |-  ( ( y  C_  x  /\  { y }  C_  x
)  <->  ( y  u. 
{ y } ) 
C_  x )
86, 7bd0 16355 . . . 4  |- BOUNDED  ( y  u.  {
y } )  C_  x
9 df-suc 4466 . . . . 5  |-  suc  y  =  ( y  u. 
{ y } )
109sseq1i 3251 . . . 4  |-  ( suc  y  C_  x  <->  ( y  u.  { y } ) 
C_  x )
118, 10bd0r 16356 . . 3  |- BOUNDED  suc  y  C_  x
122, 11ax-bdan 16346 . 2  |- BOUNDED  ( x  C_  suc  y  /\  suc  y  C_  x )
13 eqss 3240 . 2  |-  ( x  =  suc  y  <->  ( x  C_ 
suc  y  /\  suc  y  C_  x ) )
1412, 13bd0r 16356 1  |- BOUNDED  x  =  suc  y
Colors of variables: wff set class
Syntax hints:    /\ wa 104    = wceq 1395    u. cun 3196    C_ wss 3198   {csn 3667   suc csuc 4460  BOUNDED wbd 16343
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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211  ax-bd0 16344  ax-bdan 16346  ax-bdor 16347  ax-bdal 16349  ax-bdeq 16351  ax-bdel 16352  ax-bdsb 16353
This theorem depends on definitions:  df-bi 117  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-v 2802  df-un 3202  df-in 3204  df-ss 3211  df-sn 3673  df-suc 4466  df-bdc 16372
This theorem is referenced by:  bj-bdsucel  16413  bj-nn0suc0  16481
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