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Theorem faosnf0.11b 41603
Description: 𝐵 is called a non-limit ordinal if it is not a limit ordinal. (Contributed by RP, 27-Sep-2023.)

Alling, Norman L. "Fundamentals of Analysis Over Surreal Numbers Fields." The Rocky Mountain Journal of Mathematics 19, no. 3 (1989): 565-73. http://www.jstor.org/stable/44237243.

Assertion
Ref Expression
faosnf0.11b ((Ord 𝐴 ∧ ¬ Lim 𝐴𝐴 ≠ ∅) → ∃𝑥 ∈ On 𝐴 = suc 𝑥)
Distinct variable group:   𝑥,𝐴

Proof of Theorem faosnf0.11b
StepHypRef Expression
1 3ancomb 1099 . . 3 ((Ord 𝐴 ∧ ¬ Lim 𝐴𝐴 ≠ ∅) ↔ (Ord 𝐴𝐴 ≠ ∅ ∧ ¬ Lim 𝐴))
2 df-3an 1089 . . 3 ((Ord 𝐴𝐴 ≠ ∅ ∧ ¬ Lim 𝐴) ↔ ((Ord 𝐴𝐴 ≠ ∅) ∧ ¬ Lim 𝐴))
3 df-ne 2942 . . . . . . . 8 (𝐴 ≠ ∅ ↔ ¬ 𝐴 = ∅)
43anbi2i 623 . . . . . . 7 ((Ord 𝐴𝐴 ≠ ∅) ↔ (Ord 𝐴 ∧ ¬ 𝐴 = ∅))
54imbi1i 349 . . . . . 6 (((Ord 𝐴𝐴 ≠ ∅) → ∃𝑥 ∈ On 𝐴 = suc 𝑥) ↔ ((Ord 𝐴 ∧ ¬ 𝐴 = ∅) → ∃𝑥 ∈ On 𝐴 = suc 𝑥))
6 pm5.6 1000 . . . . . 6 (((Ord 𝐴 ∧ ¬ 𝐴 = ∅) → ∃𝑥 ∈ On 𝐴 = suc 𝑥) ↔ (Ord 𝐴 → (𝐴 = ∅ ∨ ∃𝑥 ∈ On 𝐴 = suc 𝑥)))
7 iman 402 . . . . . 6 ((Ord 𝐴 → (𝐴 = ∅ ∨ ∃𝑥 ∈ On 𝐴 = suc 𝑥)) ↔ ¬ (Ord 𝐴 ∧ ¬ (𝐴 = ∅ ∨ ∃𝑥 ∈ On 𝐴 = suc 𝑥)))
85, 6, 73bitrri 297 . . . . 5 (¬ (Ord 𝐴 ∧ ¬ (𝐴 = ∅ ∨ ∃𝑥 ∈ On 𝐴 = suc 𝑥)) ↔ ((Ord 𝐴𝐴 ≠ ∅) → ∃𝑥 ∈ On 𝐴 = suc 𝑥))
9 dflim3 7775 . . . . 5 (Lim 𝐴 ↔ (Ord 𝐴 ∧ ¬ (𝐴 = ∅ ∨ ∃𝑥 ∈ On 𝐴 = suc 𝑥)))
108, 9xchnxbir 332 . . . 4 (¬ Lim 𝐴 ↔ ((Ord 𝐴𝐴 ≠ ∅) → ∃𝑥 ∈ On 𝐴 = suc 𝑥))
1110anbi2i 623 . . 3 (((Ord 𝐴𝐴 ≠ ∅) ∧ ¬ Lim 𝐴) ↔ ((Ord 𝐴𝐴 ≠ ∅) ∧ ((Ord 𝐴𝐴 ≠ ∅) → ∃𝑥 ∈ On 𝐴 = suc 𝑥)))
121, 2, 113bitri 296 . 2 ((Ord 𝐴 ∧ ¬ Lim 𝐴𝐴 ≠ ∅) ↔ ((Ord 𝐴𝐴 ≠ ∅) ∧ ((Ord 𝐴𝐴 ≠ ∅) → ∃𝑥 ∈ On 𝐴 = suc 𝑥)))
13 pm3.35 801 . 2 (((Ord 𝐴𝐴 ≠ ∅) ∧ ((Ord 𝐴𝐴 ≠ ∅) → ∃𝑥 ∈ On 𝐴 = suc 𝑥)) → ∃𝑥 ∈ On 𝐴 = suc 𝑥)
1412, 13sylbi 216 1 ((Ord 𝐴 ∧ ¬ Lim 𝐴𝐴 ≠ ∅) → ∃𝑥 ∈ On 𝐴 = suc 𝑥)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 396  wo 845  w3a 1087   = wceq 1541  wne 2941  wrex 3071  c0 4280  Ord word 6314  Oncon0 6315  Lim wlim 6316  suc csuc 6317
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-ext 2708  ax-sep 5254  ax-nul 5261  ax-pr 5382  ax-un 7664
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3or 1088  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-sb 2068  df-clab 2715  df-cleq 2729  df-clel 2815  df-ne 2942  df-ral 3063  df-rex 3072  df-rab 3406  df-v 3445  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-pss 3927  df-nul 4281  df-if 4485  df-pw 4560  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4864  df-br 5104  df-opab 5166  df-tr 5221  df-eprel 5535  df-po 5543  df-so 5544  df-fr 5586  df-we 5588  df-ord 6318  df-on 6319  df-lim 6320  df-suc 6321
This theorem is referenced by: (None)
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