Theorem relssi 5211

Description: Inference from subclass principle for relations. (Contributed by NM, 31-Mar-1998.)

Hypotheses

Ref	Expression
relssi.1	|- Rel A
relssi.2	|- ( <. x , y >. e. A -> <. x , y >. e. B )

Assertion

Ref	Expression
relssi	|- A C_ B

Distinct variable groups:   x, y, A   x, B, y

Proof of Theorem relssi

Step	Hyp	Ref	Expression
1		relssi.1	. . 3 |- Rel A
2		ssrel 5207	. . 3 |- ( Rel A -> ( A C_ B <-> A. x A. y ( <. x , y >. e. A -> <. x , y >. e. B ) ) )
3	1, 2	ax-mp 5	. 2 |- ( A C_ B <-> A. x A. y ( <. x , y >. e. A -> <. x , y >. e. B ) )
4		relssi.2	. . 3 |- ( <. x , y >. e. A -> <. x , y >. e. B )
5	4	ax-gen 1722	. 2 |- A. y ( <. x , y >. e. A -> <. x , y >. e. B )
6	3, 5	mpgbir 1726	1 |- A C_ B

Syntax hints:   -> wi 4   <-> wb 196   A.wal 1481   e. wcel 1990   C_ wss 3574   <.cop 4183   Rel wrel 5119

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-clab 2609  df-cleq 2615  df-clel 2618  df-in 3581  df-ss 3588  df-opab 4713  df-xp 5120  df-rel 5121

This theorem is referenced by:  xpsspw  5233  oprssdm  6815  resiexg  7102  dftpos4  7371  enssdom  7980  idssen  8000  txuni2  21368  txpss3v  31985  pprodss4v  31991  xrnss3v  34135  aoprssdm  41282