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Theorem pw1ne3 7553
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 6688 . . . . 5 1o ∈ 2o
2 ssnel 4696 . . . . 5 (2o ⊆ 1o → ¬ 1o ∈ 2o)
31, 2mt2 645 . . . 4 ¬ 2o ⊆ 1o
4 2onn 6767 . . . . . 6 2o ∈ ω
54elexi 2828 . . . . 5 2o ∈ V
65elpw 3680 . . . 4 (2o ∈ 𝒫 1o ↔ 2o ⊆ 1o)
73, 6mtbir 678 . . 3 ¬ 2o ∈ 𝒫 1o
85sucid 4543 . . . . 5 2o ∈ suc 2o
9 df-3o 6662 . . . . 5 3o = suc 2o
108, 9eleqtrri 2310 . . . 4 2o ∈ 3o
11 eleq2 2298 . . . 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 2417 1 𝒫 1o ≠ 3o
Colors of variables: wff set class
Syntax hints:   = wceq 1398  wcel 2205  wne 2414  wss 3214  𝒫 cpw 3674  suc csuc 4491  ωcom 4717  1oc1o 6653  2oc2o 6654  3oc3o 6655
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 2207  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-nul 4241  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-v 2817  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3676  df-sn 3700  df-pr 3701  df-uni 3920  df-int 3955  df-tr 4214  df-iord 4492  df-on 4494  df-suc 4497  df-iom 4718  df-1o 6660  df-2o 6661  df-3o 6662
This theorem is referenced by:  3nelsucpw1  7557
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