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Theorem pw1ne3 7448
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 6610 . . . . 5 1o ∈ 2o
2 ssnel 4667 . . . . 5 (2o ⊆ 1o → ¬ 1o ∈ 2o)
31, 2mt2 645 . . . 4 ¬ 2o ⊆ 1o
4 2onn 6689 . . . . . 6 2o ∈ ω
54elexi 2815 . . . . 5 2o ∈ V
65elpw 3658 . . . 4 (2o ∈ 𝒫 1o ↔ 2o ⊆ 1o)
73, 6mtbir 677 . . 3 ¬ 2o ∈ 𝒫 1o
85sucid 4514 . . . . 5 2o ∈ suc 2o
9 df-3o 6584 . . . . 5 3o = suc 2o
108, 9eleqtrri 2307 . . . 4 2o ∈ 3o
11 eleq2 2295 . . . 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 2405 1 𝒫 1o ≠ 3o
Colors of variables: wff set class
Syntax hints:   = wceq 1397  wcel 2202  wne 2402  wss 3200  𝒫 cpw 3652  suc csuc 4462  ωcom 4688  1oc1o 6575  2oc2o 6576  3oc3o 6577
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-ral 2515  df-rex 2516  df-v 2804  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-uni 3894  df-int 3929  df-tr 4188  df-iord 4463  df-on 4465  df-suc 4468  df-iom 4689  df-1o 6582  df-2o 6583  df-3o 6584
This theorem is referenced by:  3nelsucpw1  7452
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