Theorem lerel 7962

Description: 'Less or equal to' is a relation. (Contributed by FL, 2-Aug-2009.) (Revised by Mario Carneiro, 28-Apr-2015.)

Assertion

Ref	Expression
lerel	|- Rel <_

Proof of Theorem lerel

Step	Hyp	Ref	Expression
1		lerelxr 7961	. 2 |- <_ C_ ( RR* X. RR* )
2		relxp 4713	. 2 |- Rel ( RR* X. RR* )
3		relss 4691	. 2 |- ( <_ C_ ( RR* X. RR* ) -> ( Rel ( RR* X. RR* ) -> Rel <_ ) )
4	1, 2, 3	mp2 16	1 |- Rel <_

Syntax hints:   C_ wss 3116   X. cxp 4602   Rel wrel 4609   RR*cxr 7932   <_ cle 7934

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 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-ext 2147

This theorem depends on definitions:  df-bi 116  df-tru 1346  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-v 2728  df-dif 3118  df-in 3122  df-ss 3129  df-opab 4044  df-xp 4610  df-rel 4611  df-le 7939

This theorem is referenced by: (None)