Theorem onelss 2348

Description: A member of an ordinal number is a subset of it.

Hypothesis

Ref	Expression
on.1	|- A e. On

Assertion

Ref	Expression
onelss	|- (B e. A -> B (_ A)

Proof of Theorem onelss

Step	Hyp	Ref	Expression
1		on.1	. 2 |- A e. On
2		onelsst 2255	. 2 |- (A e. On -> (B e. A -> B (_ A))
3	1, 2	ax-mp 6	1 |- (B e. A -> B (_ A)

Syntax hints:   -> wi 2   e. wcel 1092   (_ wss 1487  Oncon0 2199

This theorem is referenced by:  onelin 2351  onelun 2352  oawordeulem 3156  rankuniss 3534  carddom 3642  cardsdomel 3658  cardaleph 3690

This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-16 922  ax-17 925  ax-ext 1074

This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-3an 583  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-ral 1205  df-rex 1206  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-sn 1811  df-pr 1812  df-op 1815  df-uni 1920  df-tr 2042  df-br 2063  df-po 2128  df-so 2138  df-fr 2169  df-we 2186  df-ord 2202  df-on 2203

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