Theorem nlim1NEW 44018

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

Step	Hyp	Ref	Expression
1		0elon 6401	. 2 ⊢ ∅ ∈ On
2		nlimsuc 44017	. . 3 ⊢ (∅ ∈ On → ¬ Lim suc ∅)
3		df-1o 8437	. . . 4 ⊢ 1o = suc ∅
4		limeq 6358	. . . 4 ⊢ (1o = suc ∅ → (Lim 1o ↔ Lim suc ∅))
5	3, 4	ax-mp 5	. . 3 ⊢ (Lim 1o ↔ Lim suc ∅)
6	2, 5	sylnibr 331	. 2 ⊢ (∅ ∈ On → ¬ Lim 1o)
7	1, 6	ax-mp 5	1 ⊢ ¬ Lim 1o

Syntax hints:  ¬ wn 3   ↔ wb 208   = wceq 1560   ∈ wcel 2142  ∅c0 4285  Oncon0 6346  Lim wlim 6347  suc csuc 6348  1_oc1o 8430

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1815  ax-4 1829  ax-5 1930  ax-6 1987  ax-7 2028  ax-8 2144  ax-9 2152  ax-ext 2734  ax-sep 5246  ax-nul 5256  ax-pr 5390

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3or 1099  df-3an 1100  df-tru 1563  df-fal 1573  df-ex 1800  df-sb 2091  df-clab 2741  df-cleq 2754  df-clel 2837  df-ne 2958  df-ral 3077  df-rex 3087  df-rab 3415  df-v 3456  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-pss 3924  df-nul 4286  df-if 4481  df-pw 4557  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-opab 5163  df-tr 5208  df-eprel 5547  df-po 5555  df-so 5556  df-fr 5600  df-we 5602  df-ord 6349  df-on 6350  df-lim 6351  df-suc 6352  df-1o 8437

This theorem is referenced by: (None)