Users' Mathboxes Mathbox for Jim Kingdon < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >   Mathboxes  >  pw1ninf Unicode version

Theorem pw1ninf 17226
Description: The powerset of  1o is not infinite. Since we cannot prove it is finite (see pw1fin 7221), this provides a concrete example of a set which we cannot show to be finite or infinite, as seen another way at inffiexmid 7217. (Contributed by Jim Kingdon, 14-Feb-2026.)
Assertion
Ref Expression
pw1ninf  |-  -.  om  ~<_  ~P 1o

Proof of Theorem pw1ninf
StepHypRef Expression
1 pw1ndom3 17225 . 2  |-  -.  3o  ~<_  ~P 1o
2 3onn 6799 . . . 4  |-  3o  e.  om
3 nnfi 7178 . . . 4  |-  ( 3o  e.  om  ->  3o  e.  Fin )
4 fict 7174 . . . 4  |-  ( 3o  e.  Fin  ->  3o  ~<_  om )
52, 3, 4mp2b 8 . . 3  |-  3o  ~<_  om
6 domtr 7076 . . 3  |-  ( ( 3o  ~<_  om  /\  om  ~<_  ~P 1o )  ->  3o  ~<_  ~P 1o )
75, 6mpan 428 . 2  |-  ( om  ~<_  ~P 1o  ->  3o  ~<_  ~P 1o )
81, 7mto 672 1  |-  -.  om  ~<_  ~P 1o
Colors of variables:    wff set class
This proof depends on syntax axioms:   -. wn 3    e. wcel 2209   ~Pcpw 3688   class class class wbr 4131   omcom 4739   1oc1o 6684   3oc3o 6686    ~<_ cdom 7025   Fincfn 7026
This proof depends on 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 4251  ax-nul 4261  ax-pow 4313  ax-pr 4348  ax-un 4580  ax-setind 4686  ax-iinf 4737
This proof depends on definitions:  df-bi 117  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-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-br 4132  df-opab 4194  df-tr 4232  df-id 4440  df-iord 4513  df-on 4515  df-suc 4518  df-iom 4740  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-res 4788  df-ima 4789  df-iota 5340  df-fun 5382  df-fn 5383  df-f 5384  df-f1 5385  df-fo 5386  df-f1o 5387  df-fv 5388  df-1o 6691  df-2o 6692  df-3o 6693  df-en 7027  df-dom 7028  df-fin 7029
This theorem is used by: (None)
  Copyright terms: Public domain W3C validator