Theorem 3brtr4g 4023

Description: Substitution of equality into both sides of a binary relation. (Contributed by NM, 16-Jan-1997.)

Hypotheses

Ref	Expression
3brtr4g.1	|- ( ph -> A R B )
3brtr4g.2	|- C = A
3brtr4g.3	|- D = B

Assertion

Ref	Expression
3brtr4g	|- ( ph -> C R D )

Proof of Theorem 3brtr4g

Step	Hyp	Ref	Expression
1		3brtr4g.1	. 2 |- ( ph -> A R B )
2		3brtr4g.2	. . 3 |- C = A
3		3brtr4g.3	. . 3 |- D = B
4	2, 3	breq12i 3998	. 2 |- ( C R D <-> A R B )
5	1, 4	sylibr 133	1 |- ( ph -> C R D )

Syntax hints:   -> wi 4   = wceq 1348   class class class wbr 3989

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-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152

This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-v 2732  df-un 3125  df-sn 3589  df-pr 3590  df-op 3592  df-br 3990

This theorem is referenced by:  eqbrtrid  4024  enpr2d  6795  crth  12178  4sqlem6  12335  trilpolemgt1  14071