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Theorem bj-el2oss1o 12984
Description: Shorter proof of el2oss1o 13191 using more axioms. (Contributed by BJ, 21-Jan-2024.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
bj-el2oss1o  |-  ( A  e.  2o  ->  A  C_  1o )

Proof of Theorem bj-el2oss1o
StepHypRef Expression
1 1on 6320 . . . 4  |-  1o  e.  On
21ontrci 4349 . . 3  |-  Tr  1o
3 trsucss 4345 . . 3  |-  ( Tr  1o  ->  ( A  e.  suc  1o  ->  A  C_  1o ) )
42, 3ax-mp 5 . 2  |-  ( A  e.  suc  1o  ->  A 
C_  1o )
5 df-2o 6314 . 2  |-  2o  =  suc  1o
64, 5eleq2s 2234 1  |-  ( A  e.  2o  ->  A  C_  1o )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 1480    C_ wss 3071   Tr wtr 4026   suc csuc 4287   1oc1o 6306   2oc2o 6307
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 603  ax-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-sep 4046  ax-nul 4054  ax-pow 4098  ax-pr 4131  ax-un 4355
This theorem depends on definitions:  df-bi 116  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ral 2421  df-rex 2422  df-v 2688  df-dif 3073  df-un 3075  df-in 3077  df-ss 3084  df-nul 3364  df-pw 3512  df-sn 3533  df-pr 3534  df-uni 3737  df-tr 4027  df-iord 4288  df-on 4290  df-suc 4293  df-1o 6313  df-2o 6314
This theorem is referenced by: (None)
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