Theorem ontrci 4428

Description: An ordinal number is a transitive class. (Contributed by NM, 11-Jun-1994.)

Hypothesis

Ref	Expression
on.1	|- A e. On

Assertion

Ref	Expression
ontrci	|- Tr A

Proof of Theorem ontrci

Step	Hyp	Ref	Expression
1		on.1	. . 3 |- A e. On
2	1	onordi 4427	. 2 |- Ord A
3		ordtr 4379	. 2 |- ( Ord A -> Tr A )
4	2, 3	ax-mp 5	1 |- Tr A

Syntax hints:   e. wcel 2148   Tr wtr 4102   Ord word 4363   Oncon0 4364

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159

This theorem depends on definitions:  df-bi 117  df-tru 1356  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-v 2740  df-in 3136  df-ss 3143  df-uni 3811  df-tr 4103  df-iord 4367  df-on 4369

This theorem is referenced by:  onunisuci  4433  exmidonfinlem  7192  bj-el2oss1o  14529  nnsf  14757