Theorem nlim0 4097

Description: The empty set is not a limit ordinal. (Contributed by NM, 24-Mar-1995.) (Proof shortened by Andrew Salmon, 25-Jul-2011.)

Assertion

Ref	Expression
nlim0	⊢ ¬ Lim ∅

Proof of Theorem nlim0

Step	Hyp	Ref	Expression
1		noel 3222	. . 3 ⊢ ¬ ∅ ∈ ∅
2		simp2 904	. . 3 ⊢ ((Ord ∅ ∧ ∅ ∈ ∅ ∧ ∅ = ∪ ∅) → ∅ ∈ ∅)
3	1, 2	mto 587	. 2 ⊢ ¬ (Ord ∅ ∧ ∅ ∈ ∅ ∧ ∅ = ∪ ∅)
4		dflim2 4073	. 2 ⊢ (Lim ∅ ↔ (Ord ∅ ∧ ∅ ∈ ∅ ∧ ∅ = ∪ ∅))
5	3, 4	mtbir 595	1 ⊢ ¬ Lim ∅

Syntax hints:  ¬ wn 3   ∧ w3a 884   = wceq 1242   ∈ wcel 1390  ∅c0 3218  ∪ cuni 3571  Ord word 4065  Lim wlim 4067

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-io 629  ax-5 1333  ax-7 1334  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-8 1392  ax-10 1393  ax-11 1394  ax-i12 1395  ax-bndl 1396  ax-4 1397  ax-17 1416  ax-i9 1420  ax-ial 1424  ax-i5r 1425  ax-ext 2019

This theorem depends on definitions:  df-bi 110  df-3an 886  df-tru 1245  df-nf 1347  df-sb 1643  df-clab 2024  df-cleq 2030  df-clel 2033  df-nfc 2164  df-v 2553  df-dif 2914  df-nul 3219  df-ilim 4072

This theorem is referenced by: (None)