Theorem ssrin 3480

Description: Add right intersection to subclass relation. (Contributed by NM, 16-Aug-1994.) (Proof shortened by Andrew Salmon, 26-Jun-2011.)

Assertion

Ref	Expression
ssrin	|- (A C_ B -> (A i^i C) C_ (B i^i C))

Proof of Theorem ssrin

Dummy variable x is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ssel 3267	. . . 4 |- (A C_ B -> (x e. A -> x e. B))
2	1	anim1d 547	. . 3 |- (A C_ B -> ((x e. A /\ x e. C) -> (x e. B /\ x e. C)))
3		elin 3219	. . 3 |- (x e. (A i^i C) <-> (x e. A /\ x e. C))
4		elin 3219	. . 3 |- (x e. (B i^i C) <-> (x e. B /\ x e. C))
5	2, 3, 4	3imtr4g 261	. 2 |- (A C_ B -> (x e. (A i^i C) -> x e. (B i^i C)))
6	5	ssrdv 3278	1 |- (A C_ B -> (A i^i C) C_ (B i^i C))

Syntax hints:   -> wi 4   /\ wa 358   e. wcel 1710   i^i cin 3208   C_ wss 3257

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-v 2861  df-nin 3211  df-compl 3212  df-in 3213  df-ss 3259

This theorem is referenced by:  sslin  3481  ss2in  3482  ssdisj  3600  ssdifin0  3631  pw1ss  4169  ssres  4990