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Theorem dfom4 9680
Description: A simplification of df-om 7905 assuming the Axiom of Infinity. (Contributed by NM, 30-May-2003.)
Assertion
Ref Expression
dfom4 ω = {𝑥 ∣ ∀𝑦(Lim 𝑦 → 𝑥 ∈ 𝑦)}
Distinct variable group:   𝑥,𝑦

Proof of Theorem dfom4
StepHypRef Expression
1 elom3 9679 . 2 (𝑥 ∈ ω ↔ ∀𝑦(Lim 𝑦 → 𝑥 ∈ 𝑦))
21eqabi 2899 1 ω = {𝑥 ∣ ∀𝑦(Lim 𝑦 → 𝑥 ∈ 𝑦)}
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4  ∀wal 1568   = wceq 1570  {cab 2741  Lim wlim 6384  ωcom 7904
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735  ax-sep 5253  ax-nul 5264  ax-pr 5396  ax-un 7778  ax-inf2 9672
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-ne 2960  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-pss 4017  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5172  df-tr 5217  df-eprel 5556  df-po 5564  df-so 5565  df-fr 5609  df-we 5611  df-ord 6386  df-on 6387  df-lim 6388  df-suc 6389  df-om 7905
This theorem is used by: (None)
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