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Theorem php5dom 6919
Description: A natural number does not dominate its successor. (Contributed by Jim Kingdon, 1-Sep-2021.)
Assertion
Ref Expression
php5dom  |-  ( A  e.  om  ->  -.  suc  A  ~<_  A )

Proof of Theorem php5dom
Dummy variables  w  k are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 suceq 4433 . . . 4  |-  ( w  =  (/)  ->  suc  w  =  suc  (/) )
2 id 19 . . . 4  |-  ( w  =  (/)  ->  w  =  (/) )
31, 2breq12d 4042 . . 3  |-  ( w  =  (/)  ->  ( suc  w  ~<_  w  <->  suc  (/)  ~<_  (/) ) )
43notbid 668 . 2  |-  ( w  =  (/)  ->  ( -. 
suc  w  ~<_  w  <->  -.  suc  (/)  ~<_  (/) ) )
5 suceq 4433 . . . 4  |-  ( w  =  k  ->  suc  w  =  suc  k )
6 id 19 . . . 4  |-  ( w  =  k  ->  w  =  k )
75, 6breq12d 4042 . . 3  |-  ( w  =  k  ->  ( suc  w  ~<_  w  <->  suc  k  ~<_  k ) )
87notbid 668 . 2  |-  ( w  =  k  ->  ( -.  suc  w  ~<_  w  <->  -.  suc  k  ~<_  k ) )
9 suceq 4433 . . . 4  |-  ( w  =  suc  k  ->  suc  w  =  suc  suc  k )
10 id 19 . . . 4  |-  ( w  =  suc  k  ->  w  =  suc  k )
119, 10breq12d 4042 . . 3  |-  ( w  =  suc  k  -> 
( suc  w  ~<_  w  <->  suc  suc  k  ~<_  suc  k ) )
1211notbid 668 . 2  |-  ( w  =  suc  k  -> 
( -.  suc  w  ~<_  w 
<->  -.  suc  suc  k  ~<_  suc  k ) )
13 suceq 4433 . . . 4  |-  ( w  =  A  ->  suc  w  =  suc  A )
14 id 19 . . . 4  |-  ( w  =  A  ->  w  =  A )
1513, 14breq12d 4042 . . 3  |-  ( w  =  A  ->  ( suc  w  ~<_  w  <->  suc  A  ~<_  A ) )
1615notbid 668 . 2  |-  ( w  =  A  ->  ( -.  suc  w  ~<_  w  <->  -.  suc  A  ~<_  A ) )
17 peano1 4626 . . . 4  |-  (/)  e.  om
18 php5 6914 . . . 4  |-  ( (/)  e.  om  ->  -.  (/)  ~~  suc  (/) )
1917, 18ax-mp 5 . . 3  |-  -.  (/)  ~~  suc  (/)
20 0ex 4156 . . . . . 6  |-  (/)  e.  _V
2120domen 6805 . . . . 5  |-  ( suc  (/) 
~<_  (/)  <->  E. x ( suc  (/)  ~~  x  /\  x  C_  (/) ) )
22 ss0 3487 . . . . . . . 8  |-  ( x 
C_  (/)  ->  x  =  (/) )
23 en0 6849 . . . . . . . 8  |-  ( x 
~~  (/)  <->  x  =  (/) )
2422, 23sylibr 134 . . . . . . 7  |-  ( x 
C_  (/)  ->  x  ~~  (/) )
25 entr 6838 . . . . . . 7  |-  ( ( suc  (/)  ~~  x  /\  x  ~~  (/) )  ->  suc  (/)  ~~  (/) )
2624, 25sylan2 286 . . . . . 6  |-  ( ( suc  (/)  ~~  x  /\  x  C_  (/) )  ->  suc  (/)  ~~  (/) )
2726exlimiv 1609 . . . . 5  |-  ( E. x ( suc  (/)  ~~  x  /\  x  C_  (/) )  ->  suc  (/)  ~~  (/) )
2821, 27sylbi 121 . . . 4  |-  ( suc  (/) 
~<_  (/)  ->  suc  (/)  ~~  (/) )
2928ensymd 6837 . . 3  |-  ( suc  (/) 
~<_  (/)  ->  (/)  ~~  suc  (/) )
3019, 29mto 663 . 2  |-  -.  suc  (/)  ~<_  (/)
31 peano2 4627 . . . 4  |-  ( k  e.  om  ->  suc  k  e.  om )
32 phplem4dom 6918 . . . 4  |-  ( ( suc  k  e.  om  /\  k  e.  om )  ->  ( suc  suc  k  ~<_  suc  k  ->  suc  k  ~<_  k ) )
3331, 32mpancom 422 . . 3  |-  ( k  e.  om  ->  ( suc  suc  k  ~<_  suc  k  ->  suc  k  ~<_  k ) )
3433con3d 632 . 2  |-  ( k  e.  om  ->  ( -.  suc  k  ~<_  k  ->  -.  suc  suc  k  ~<_  suc  k
) )
354, 8, 12, 16, 30, 34finds 4632 1  |-  ( A  e.  om  ->  -.  suc  A  ~<_  A )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    = wceq 1364   E.wex 1503    e. wcel 2164    C_ wss 3153   (/)c0 3446   class class class wbr 4029   suc csuc 4396   omcom 4622    ~~ cen 6792    ~<_ cdom 6793
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 615  ax-in2 616  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-nul 4155  ax-pow 4203  ax-pr 4238  ax-un 4464  ax-setind 4569  ax-iinf 4620
This theorem depends on definitions:  df-bi 117  df-dc 836  df-3or 981  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ne 2365  df-ral 2477  df-rex 2478  df-rab 2481  df-v 2762  df-sbc 2986  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3447  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-uni 3836  df-int 3871  df-br 4030  df-opab 4091  df-tr 4128  df-id 4324  df-iord 4397  df-on 4399  df-suc 4402  df-iom 4623  df-xp 4665  df-rel 4666  df-cnv 4667  df-co 4668  df-dm 4669  df-rn 4670  df-res 4671  df-ima 4672  df-iota 5215  df-fun 5256  df-fn 5257  df-f 5258  df-f1 5259  df-fo 5260  df-f1o 5261  df-fv 5262  df-er 6587  df-en 6795  df-dom 6796
This theorem is referenced by:  nndomo  6920  phpm  6921  infnfi  6951
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