Theorem lecon3 157

Description: Contrapositive for l.e.

Hypothesis

Ref	Expression
lecon3.1	a =< b'

Assertion

Ref	Expression
lecon3	b =< a'

Proof of Theorem lecon3

Step	Hyp	Ref	Expression
1		lecon3.1	. . . 4 a =< b'
2	1	lecon 154	. . 3 b'' =< a'
3	2	lecon2 156	. 2 a'' =< b'
4	3	lecon1 155	1 b =< a'

Syntax hints:   =< wle 2  'wn 4

This theorem is referenced by:  ortha 438  mhlemlem1 874  mhlem 876  e2ast2 894  e2astlem1 895  govar2 897  gomaex3lem2 915  oa3to4lem6 950  oa3to4 951  oa4to6 965

This theorem was proved from axioms:  ax-a1 30  ax-a2 31  ax-a5 34  ax-r1 35  ax-r2 36  ax-r4 37  ax-r5 38

This theorem depends on definitions:  df-a 40  df-le1 130  df-le2 131

Copyright terms: Public domain