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Theorem nlim1NEW 44059
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 6417 . 2 ∅ ∈ On
2 nlimsuc 44058 . . 3 (∅ ∈ On → ¬ Lim suc ∅)
3 df-1o 8452 . . . 4 1o = suc ∅
4 limeq 6373 . . . 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
Syntax hints:  ¬ wn 3  wb 209   = wceq 1567  wcel 2149  c0 4294  Oncon0 6361  Lim wlim 6362  suc csuc 6363  1oc1o 8445
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-ext 2741  ax-sep 5261  ax-nul 5271  ax-pr 5405
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1102  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-sb 2098  df-clab 2748  df-cleq 2761  df-clel 2844  df-ne 2965  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-pss 3933  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-br 5114  df-opab 5178  df-tr 5223  df-eprel 5562  df-po 5570  df-so 5571  df-fr 5615  df-we 5617  df-ord 6364  df-on 6365  df-lim 6366  df-suc 6367  df-1o 8452
This theorem is referenced by: (None)
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