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Theorem regexmid 4418
Description: The axiom of foundation implies excluded middle.

By foundation (or regularity), we mean the principle that every inhabited set has an element which is minimal (when arranged by  e.). The statement of foundation here is taken from Metamath Proof Explorer's ax-reg, and is identical (modulo one unnecessary quantifier) to the statement of foundation in Theorem "Foundation implies instances of EM" of [Crosilla], p. "Set-theoretic principles incompatible with intuitionistic logic".

For this reason, IZF does not adopt foundation as an axiom and instead replaces it with ax-setind 4420. (Contributed by Jim Kingdon, 3-Sep-2019.)

Hypothesis
Ref Expression
regexmid.1  |-  ( E. y  y  e.  x  ->  E. y ( y  e.  x  /\  A. z ( z  e.  y  ->  -.  z  e.  x ) ) )
Assertion
Ref Expression
regexmid  |-  ( ph  \/  -.  ph )
Distinct variable group:    ph, x, y, z

Proof of Theorem regexmid
Dummy variable  w is distinct from all other variables.
StepHypRef Expression
1 eqid 2115 . . 3  |-  { w  e.  { (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  =  { w  e.  { (/) ,  { (/) } }  | 
( w  =  { (/)
}  \/  ( w  =  (/)  /\  ph )
) }
21regexmidlemm 4415 . 2  |-  E. y 
y  e.  { w  e.  { (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }
3 pp0ex 4081 . . . 4  |-  { (/) ,  { (/) } }  e.  _V
43rabex 4040 . . 3  |-  { w  e.  { (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  e.  _V
5 eleq2 2179 . . . . 5  |-  ( x  =  { w  e. 
{ (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  ->  ( y  e.  x  <->  y  e.  { w  e.  { (/) ,  { (/) } }  | 
( w  =  { (/)
}  \/  ( w  =  (/)  /\  ph )
) } ) )
65exbidv 1779 . . . 4  |-  ( x  =  { w  e. 
{ (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  ->  ( E. y  y  e.  x  <->  E. y  y  e. 
{ w  e.  { (/)
,  { (/) } }  |  ( w  =  { (/) }  \/  (
w  =  (/)  /\  ph ) ) } ) )
7 eleq2 2179 . . . . . . . . 9  |-  ( x  =  { w  e. 
{ (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  ->  ( z  e.  x  <->  z  e.  { w  e.  { (/) ,  { (/) } }  | 
( w  =  { (/)
}  \/  ( w  =  (/)  /\  ph )
) } ) )
87notbid 639 . . . . . . . 8  |-  ( x  =  { w  e. 
{ (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  ->  ( -.  z  e.  x  <->  -.  z  e.  { w  e.  { (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) } ) )
98imbi2d 229 . . . . . . 7  |-  ( x  =  { w  e. 
{ (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  ->  ( ( z  e.  y  ->  -.  z  e.  x )  <->  ( z  e.  y  ->  -.  z  e.  { w  e.  { (/)
,  { (/) } }  |  ( w  =  { (/) }  \/  (
w  =  (/)  /\  ph ) ) } ) ) )
109albidv 1778 . . . . . 6  |-  ( x  =  { w  e. 
{ (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  ->  ( A. z ( z  e.  y  ->  -.  z  e.  x )  <->  A. z ( z  e.  y  ->  -.  z  e.  { w  e.  { (/)
,  { (/) } }  |  ( w  =  { (/) }  \/  (
w  =  (/)  /\  ph ) ) } ) ) )
115, 10anbi12d 462 . . . . 5  |-  ( x  =  { w  e. 
{ (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  ->  ( ( y  e.  x  /\  A. z ( z  e.  y  ->  -.  z  e.  x )
)  <->  ( y  e. 
{ w  e.  { (/)
,  { (/) } }  |  ( w  =  { (/) }  \/  (
w  =  (/)  /\  ph ) ) }  /\  A. z ( z  e.  y  ->  -.  z  e.  { w  e.  { (/)
,  { (/) } }  |  ( w  =  { (/) }  \/  (
w  =  (/)  /\  ph ) ) } ) ) ) )
1211exbidv 1779 . . . 4  |-  ( x  =  { w  e. 
{ (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  ->  ( E. y ( y  e.  x  /\  A. z ( z  e.  y  ->  -.  z  e.  x ) )  <->  E. y
( y  e.  {
w  e.  { (/) ,  { (/) } }  | 
( w  =  { (/)
}  \/  ( w  =  (/)  /\  ph )
) }  /\  A. z ( z  e.  y  ->  -.  z  e.  { w  e.  { (/)
,  { (/) } }  |  ( w  =  { (/) }  \/  (
w  =  (/)  /\  ph ) ) } ) ) ) )
136, 12imbi12d 233 . . 3  |-  ( x  =  { w  e. 
{ (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  ->  ( ( E. y  y  e.  x  ->  E. y
( y  e.  x  /\  A. z ( z  e.  y  ->  -.  z  e.  x )
) )  <->  ( E. y  y  e.  { w  e.  { (/) ,  { (/) } }  |  ( w  =  { (/) }  \/  ( w  =  (/)  /\  ph ) ) }  ->  E. y ( y  e. 
{ w  e.  { (/)
,  { (/) } }  |  ( w  =  { (/) }  \/  (
w  =  (/)  /\  ph ) ) }  /\  A. z ( z  e.  y  ->  -.  z  e.  { w  e.  { (/)
,  { (/) } }  |  ( w  =  { (/) }  \/  (
w  =  (/)  /\  ph ) ) } ) ) ) ) )
14 regexmid.1 . . 3  |-  ( E. y  y  e.  x  ->  E. y ( y  e.  x  /\  A. z ( z  e.  y  ->  -.  z  e.  x ) ) )
154, 13, 14vtocl 2712 . 2  |-  ( E. y  y  e.  {
w  e.  { (/) ,  { (/) } }  | 
( w  =  { (/)
}  \/  ( w  =  (/)  /\  ph )
) }  ->  E. y
( y  e.  {
w  e.  { (/) ,  { (/) } }  | 
( w  =  { (/)
}  \/  ( w  =  (/)  /\  ph )
) }  /\  A. z ( z  e.  y  ->  -.  z  e.  { w  e.  { (/)
,  { (/) } }  |  ( w  =  { (/) }  \/  (
w  =  (/)  /\  ph ) ) } ) ) )
161regexmidlem1 4416 . 2  |-  ( E. y ( y  e. 
{ w  e.  { (/)
,  { (/) } }  |  ( w  =  { (/) }  \/  (
w  =  (/)  /\  ph ) ) }  /\  A. z ( z  e.  y  ->  -.  z  e.  { w  e.  { (/)
,  { (/) } }  |  ( w  =  { (/) }  \/  (
w  =  (/)  /\  ph ) ) } ) )  ->  ( ph  \/  -.  ph ) )
172, 15, 16mp2b 8 1  |-  ( ph  \/  -.  ph )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 103    \/ wo 680   A.wal 1312    = wceq 1314   E.wex 1451    e. wcel 1463   {crab 2395   (/)c0 3331   {csn 3495   {cpr 3496
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 586  ax-in2 587  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-14 1475  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097  ax-sep 4014  ax-nul 4022  ax-pow 4066
This theorem depends on definitions:  df-bi 116  df-tru 1317  df-nf 1420  df-sb 1719  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2245  df-rab 2400  df-v 2660  df-dif 3041  df-un 3043  df-in 3045  df-ss 3052  df-nul 3332  df-pw 3480  df-sn 3501  df-pr 3502
This theorem is referenced by: (None)
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