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Theorem onsucssi 6676
 Description: A set belongs to an ordinal number iff its successor is a subset of the ordinal number. Exercise 8 of [TakeutiZaring] p. 42 and its converse. (Contributed by NM, 16-Sep-1995.)
Hypotheses
Ref Expression
onssi.1
onsucssi.2
Assertion
Ref Expression
onsucssi

Proof of Theorem onsucssi
StepHypRef Expression
1 onssi.1 . 2
2 onsucssi.2 . . 3
32onordi 4987 . 2
4 ordelsuc 6655 . 2
51, 3, 4mp2an 672 1
 Colors of variables: wff setvar class Syntax hints:  <->wb 184  e.wcel 1818  C_wss 3475  Ordword 4882   con0 4883  succsuc 4885 This theorem is referenced by:  omopthlem1  7323  rankval4  8306  rankc1  8309  rankc2  8310  rankxplim  8318  rankxplim3  8320  onsucsuccmpi  29908 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-8 1820  ax-9 1822  ax-10 1837  ax-11 1842  ax-12 1854  ax-13 1999  ax-ext 2435  ax-sep 4573  ax-nul 4581  ax-pr 4691  ax-un 6592 This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3or 974  df-3an 975  df-tru 1398  df-ex 1613  df-nf 1617  df-sb 1740  df-eu 2286  df-mo 2287  df-clab 2443  df-cleq 2449  df-clel 2452  df-nfc 2607  df-ne 2654  df-ral 2812  df-rex 2813  df-rab 2816  df-v 3111  df-sbc 3328  df-dif 3478  df-un 3480  df-in 3482  df-ss 3489  df-pss 3491  df-nul 3785  df-if 3942  df-sn 4030  df-pr 4032  df-tp 4034  df-op 4036  df-uni 4250  df-br 4453  df-opab 4511  df-tr 4546  df-eprel 4796  df-po 4805  df-so 4806  df-fr 4843  df-we 4845  df-ord 4886  df-on 4887  df-suc 4889
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