Theorem lerel 8090

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 8089	. 2 |- <_ C_ ( RR* X. RR* )
2		relxp 4772	. 2 |- Rel ( RR* X. RR* )
3		relss 4750	. 2 |- ( <_ C_ ( RR* X. RR* ) -> ( Rel ( RR* X. RR* ) -> Rel <_ ) )
4	1, 2, 3	mp2 16	1 |- Rel <_

Syntax hints:   C_ wss 3157   X. cxp 4661   Rel wrel 4668   RR*cxr 8060   <_ cle 8062

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-in1 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178

This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-v 2765  df-dif 3159  df-in 3163  df-ss 3170  df-opab 4095  df-xp 4669  df-rel 4670  df-le 8067

This theorem is referenced by: (None)