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Theorem bdvsn 16469
Description: Equality of a setvar with a singleton of a setvar is a bounded formula. (Contributed by BJ, 16-Oct-2019.)
Assertion
Ref Expression
bdvsn  |- BOUNDED  x  =  {
y }
Distinct variable group:    x, y

Proof of Theorem bdvsn
StepHypRef Expression
1 bdcsn 16465 . . . 4  |- BOUNDED  { y }
21bdss 16459 . . 3  |- BOUNDED  x  C_  { y }
3 bdcv 16443 . . . 4  |- BOUNDED  x
43bdsnss 16468 . . 3  |- BOUNDED  { y }  C_  x
52, 4ax-bdan 16410 . 2  |- BOUNDED  ( x  C_  { y }  /\  { y }  C_  x )
6 eqss 3242 . 2  |-  ( x  =  { y }  <-> 
( x  C_  { y }  /\  { y }  C_  x )
)
75, 6bd0r 16420 1  |- BOUNDED  x  =  {
y }
Colors of variables: wff set class
Syntax hints:    /\ wa 104    = wceq 1397    C_ wss 3200   {csn 3669  BOUNDED wbd 16407
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2213  ax-bd0 16408  ax-bdan 16410  ax-bdal 16413  ax-bdeq 16415  ax-bdel 16416  ax-bdsb 16417
This theorem depends on definitions:  df-bi 117  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-v 2804  df-in 3206  df-ss 3213  df-sn 3675  df-bdc 16436
This theorem is referenced by:  bdop  16470
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