Theorem omsson 7564

Description: Omega is a subset of On. (Contributed by NM, 13-Jun-1994.) (Proof shortened by Andrew Salmon, 27-Aug-2011.)

Assertion

Ref	Expression
omsson	⊢ ω ⊆ On

Proof of Theorem omsson

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		dfom2 7562	. 2 ⊢ ω = {𝑥 ∈ On ∣ suc 𝑥 ⊆ {𝑦 ∈ On ∣ ¬ Lim 𝑦}}
2	1	ssrab3 4008	1 ⊢ ω ⊆ On

Syntax hints:  ¬ wn 3  {crab 3110   ⊆ wss 3881  Oncon0 6159  Lim wlim 6160  suc csuc 6161  ωcom 7560

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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5167  ax-nul 5174  ax-pr 5295  ax-un 7441

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ne 2988  df-ral 3111  df-rex 3112  df-rab 3115  df-v 3443  df-sbc 3721  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-pss 3900  df-nul 4244  df-if 4426  df-sn 4526  df-pr 4528  df-tp 4530  df-op 4532  df-uni 4801  df-br 5031  df-opab 5093  df-tr 5137  df-eprel 5430  df-po 5438  df-so 5439  df-fr 5478  df-we 5480  df-ord 6162  df-on 6163  df-lim 6164  df-suc 6165  df-om 7561

This theorem is referenced by:  limomss  7565  nnon  7566  ordom  7569  omssnlim  7574  omsinds  7580  nnunifi  8753  unblem1  8754  unblem2  8755  unblem3  8756  unblem4  8757  isfinite2  8760  card2inf  9003  ackbij1lem16  9646  ackbij1lem18  9648  fin23lem26  9736  fin23lem27  9739  isf32lem5  9768  fin1a2lem6  9816  pwfseqlem3  10071  tskinf  10180  grothomex  10240  ltsopi  10299  dmaddpi  10301  dmmulpi  10302  2ndcdisj  22061  finminlem  33779