ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  nninfwlpor Unicode version

Theorem nninfwlpor 7507
Description: The Weak Limited Principle of Omniscience (WLPO) implies that equality for ℕ is decidable. (Contributed by Jim Kingdon, 7-Dec-2024.)
Assertion
Ref Expression
nninfwlpor  |-  ( om  e. WOmni  ->  A. x  e.  A. y  e. DECID  x  =  y )
Distinct variable group:    x, y

Proof of Theorem nninfwlpor
Dummy variables  i  j are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 nninff 7455 . . . 4  |-  ( x  e.  ->  x : om --> 2o )
21ad2antrl 494 . . 3  |-  ( ( om  e. WOmni  /\  (
x  e.  /\  y  e. ) )  ->  x : om --> 2o )
3 nninff 7455 . . . 4  |-  ( y  e.  ->  y : om --> 2o )
43ad2antll 495 . . 3  |-  ( ( om  e. WOmni  /\  (
x  e.  /\  y  e. ) )  ->  y : om --> 2o )
5 fveq2 5693 . . . . . 6  |-  ( j  =  i  ->  (
x `  j )  =  ( x `  i ) )
6 fveq2 5693 . . . . . 6  |-  ( j  =  i  ->  (
y `  j )  =  ( y `  i ) )
75, 6eqeq12d 2253 . . . . 5  |-  ( j  =  i  ->  (
( x `  j
)  =  ( y `
 j )  <->  ( x `  i )  =  ( y `  i ) ) )
87ifbid 3662 . . . 4  |-  ( j  =  i  ->  if ( ( x `  j )  =  ( y `  j ) ,  1o ,  (/) )  =  if (
( x `  i
)  =  ( y `
 i ) ,  1o ,  (/) ) )
98cbvmptv 4225 . . 3  |-  ( j  e.  om  |->  if ( ( x `  j
)  =  ( y `
 j ) ,  1o ,  (/) ) )  =  ( i  e. 
om  |->  if ( ( x `  i )  =  ( y `  i ) ,  1o ,  (/) ) )
10 simpl 109 . . 3  |-  ( ( om  e. WOmni  /\  (
x  e.  /\  y  e. ) )  ->  om  e. WOmni )
112, 4, 9, 10nninfwlporlem 7506 . 2  |-  ( ( om  e. WOmni  /\  (
x  e.  /\  y  e. ) )  -> DECID  x  =  y
)
1211ralrimivva 2632 1  |-  ( om  e. WOmni  ->  A. x  e.  A. y  e. DECID  x  =  y )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104  DECID wdc 846    = wceq 1402    e. wcel 2209   A.wral 2528   (/)c0 3520   ifcif 3638    |-> cmpt 4190   omcom 4735   -->wf 5371   ` cfv 5375   1oc1o 6673   2oc2o 6674  ℕxnninf 7452  WOmnicwomni 7496
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-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4247  ax-nul 4257  ax-pow 4309  ax-pr 4344  ax-un 4576  ax-setind 4682  ax-iinf 4733
This theorem depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-int 3969  df-br 4129  df-opab 4191  df-mpt 4192  df-tr 4228  df-id 4436  df-iord 4509  df-on 4511  df-suc 4514  df-iom 4736  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-ima 4785  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-fv 5383  df-ov 6081  df-oprab 6082  df-mpo 6083  df-1o 6680  df-2o 6681  df-map 6917  df-nninf 7453  df-womni 7497
This theorem is referenced by:  nninfwlpo  7514
  Copyright terms: Public domain W3C validator