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Theorem pw1ne3 7539
Description: The power set of 1o is not three. (Contributed by James E. Hanson and Jim Kingdon, 30-Jul-2024.)
Assertion
Ref Expression
pw1ne3 𝒫 1o ≠ 3o

Proof of Theorem pw1ne3
StepHypRef Expression
1 1lt2o 6674 . . . . 5 1o ∈ 2o
2 ssnel 4690 . . . . 5 (2o ⊆ 1o → ¬ 1o ∈ 2o)
31, 2mt2 645 . . . 4 ¬ 2o ⊆ 1o
4 2onn 6753 . . . . . 6 2o ∈ ω
54elexi 2825 . . . . 5 2o ∈ V
65elpw 3674 . . . 4 (2o ∈ 𝒫 1o ↔ 2o ⊆ 1o)
73, 6mtbir 678 . . 3 ¬ 2o ∈ 𝒫 1o
85sucid 4537 . . . . 5 2o ∈ suc 2o
9 df-3o 6648 . . . . 5 3o = suc 2o
108, 9eleqtrri 2308 . . . 4 2o ∈ 3o
11 eleq2 2296 . . . 4 (𝒫 1o = 3o → (2o ∈ 𝒫 1o ↔ 2o ∈ 3o))
1210, 11mpbiri 168 . . 3 (𝒫 1o = 3o → 2o ∈ 𝒫 1o)
137, 12mto 668 . 2 ¬ 𝒫 1o = 3o
1413neir 2415 1 𝒫 1o ≠ 3o
Colors of variables: wff set class
Syntax hints:   = wceq 1398  wcel 2203  wne 2412  wss 3210  𝒫 cpw 3668  suc csuc 4485  ωcom 4711  1oc1o 6639  2oc2o 6640  3oc3o 6641
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-sep 4227  ax-nul 4235  ax-pow 4286  ax-pr 4321  ax-un 4553  ax-setind 4658
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-ral 2525  df-rex 2526  df-v 2814  df-dif 3212  df-un 3214  df-in 3216  df-ss 3223  df-nul 3508  df-pw 3670  df-sn 3694  df-pr 3695  df-uni 3914  df-int 3949  df-tr 4208  df-iord 4486  df-on 4488  df-suc 4491  df-iom 4712  df-1o 6646  df-2o 6647  df-3o 6648
This theorem is referenced by:  3nelsucpw1  7543
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