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Theorem nlim1NEW 44704
Description: 1 is not a limit ordinal. (Contributed by BTernaryTau, 1-Dec-2024.) (Proof shortened by RP, 13-Dec-2024.)
Assertion
Ref Expression
nlim1NEW ¬ Lim 1o

Proof of Theorem nlim1NEW
StepHypRef Expression
1 0elon 6444 . 2 ∅ ∈ On
2 nlimsuc 44703 . . 3 (∅ ∈ On → ¬ Lim suc ∅)
3 df-1o 8514 . . . 4 1o = suc ∅
4 limeq 6400 . . . 4 (1o = suc ∅ → (Lim 1o ↔ Lim suc ∅))
53, 4ax-mp 5 . . 3 (Lim 1o ↔ Lim suc ∅)
62, 5sylnibr 332 . 2 (∅ ∈ On → ¬ Lim 1o)
71, 6ax-mp 5 1 ¬ Lim 1o
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3   ↔ wb 209   = wceq 1570   ∈ wcel 2147  ∅c0 4281  Oncon0 6388  Lim wlim 6389  suc csuc 6390  1oc1o 8507
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735  ax-sep 5255  ax-nul 5266  ax-pr 5398
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-ne 2960  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-pss 4017  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4841  df-uni 4873  df-br 5109  df-opab 5174  df-tr 5219  df-eprel 5558  df-po 5566  df-so 5567  df-fr 5611  df-we 5613  df-ord 6391  df-on 6392  df-lim 6393  df-suc 6394  df-1o 8514
This theorem is used by: (None)
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