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Theorem nnlim 7836
Description: A natural number is not a limit ordinal. (Contributed by NM, 18-Oct-1995.)
Assertion
Ref Expression
nnlim (𝐴 ∈ ω → ¬ Lim 𝐴)

Proof of Theorem nnlim
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 nnord 7830 . . 3 (𝐴 ∈ ω → Ord 𝐴)
2 ordirr 6338 . . 3 (Ord 𝐴 → ¬ 𝐴𝐴)
31, 2syl 17 . 2 (𝐴 ∈ ω → ¬ 𝐴𝐴)
4 elom 7825 . . . 4 (𝐴 ∈ ω ↔ (𝐴 ∈ On ∧ ∀𝑥(Lim 𝑥𝐴𝑥)))
54simprbi 496 . . 3 (𝐴 ∈ ω → ∀𝑥(Lim 𝑥𝐴𝑥))
6 limeq 6332 . . . . 5 (𝑥 = 𝐴 → (Lim 𝑥 ↔ Lim 𝐴))
7 eleq2 2817 . . . . 5 (𝑥 = 𝐴 → (𝐴𝑥𝐴𝐴))
86, 7imbi12d 344 . . . 4 (𝑥 = 𝐴 → ((Lim 𝑥𝐴𝑥) ↔ (Lim 𝐴𝐴𝐴)))
98spcgv 3559 . . 3 (𝐴 ∈ ω → (∀𝑥(Lim 𝑥𝐴𝑥) → (Lim 𝐴𝐴𝐴)))
105, 9mpd 15 . 2 (𝐴 ∈ ω → (Lim 𝐴𝐴𝐴))
113, 10mtod 198 1 (𝐴 ∈ ω → ¬ Lim 𝐴)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wal 1538   = wceq 1540  wcel 2109  Ord word 6319  Oncon0 6320  Lim wlim 6321  ωcom 7822
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-ext 2701  ax-sep 5246  ax-nul 5256  ax-pr 5382
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2721  df-clel 2803  df-ne 2926  df-ral 3045  df-rex 3054  df-rab 3403  df-v 3446  df-dif 3914  df-un 3916  df-ss 3928  df-nul 4293  df-if 4485  df-pw 4561  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4868  df-br 5103  df-opab 5165  df-tr 5210  df-eprel 5531  df-po 5539  df-so 5540  df-fr 5584  df-we 5586  df-ord 6323  df-on 6324  df-lim 6325  df-om 7823
This theorem is referenced by:  omssnlim  7837  nnsuc  7840  cantnfp1lem2  9608  cantnflem1  9618  cnfcom2lem  9630  1oequni2o  37329  finxp1o  37353  finxpreclem4  37355  dflim5  43291
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