Theorem sess2 4848

Description: Subset theorem for the set-like predicate. (Contributed by Mario Carneiro, 24-Jun-2015.)

Assertion

Ref	Expression
sess2	|- ( A C_ B -> ( R Se B -> R Se A ) )

Proof of Theorem sess2

Dummy variables x y are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ssralv 3564	. . 3 |- ( A C_ B -> ( A. x e. B { y e. B | y R x } e. _V -> A. x e. A { y e. B | y R x } e. _V ) )
2		rabss2 3583	. . . . 5 |- ( A C_ B -> { y e. A | y R x } C_ { y e. B | y R x } )
3		ssexg 4593	. . . . . 6 |- ( ( { y e. A | y R x } C_ { y e. B | y R x } /\ { y e. B | y R x } e. _V ) -> { y e. A | y R x } e. _V )
4	3	ex 434	. . . . 5 |- ( { y e. A | y R x } C_ { y e. B | y R x } -> ( { y e. B | y R x } e. _V -> { y e. A | y R x } e. _V ) )
5	2, 4	syl 16	. . . 4 |- ( A C_ B -> ( { y e. B | y R x } e. _V -> { y e. A | y R x } e. _V ) )
6	5	ralimdv 2874	. . 3 |- ( A C_ B -> ( A. x e. A { y e. B | y R x } e. _V -> A. x e. A { y e. A | y R x } e. _V ) )
7	1, 6	syld 44	. 2 |- ( A C_ B -> ( A. x e. B { y e. B | y R x } e. _V -> A. x e. A { y e. A | y R x } e. _V ) )
8		df-se 4839	. 2 |- ( R Se B <-> A. x e. B { y e. B | y R x } e. _V )
9		df-se 4839	. 2 |- ( R Se A <-> A. x e. A { y e. A | y R x } e. _V )
10	7, 8, 9	3imtr4g 270	1 |- ( A C_ B -> ( R Se B -> R Se A ) )

Syntax hints:   -> wi 4   e. wcel 1767   A.wral 2814   {crab 2818   _Vcvv 3113   C_ wss 3476   class class class wbr 4447   Se wse 4836

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1601  ax-4 1612  ax-5 1680  ax-6 1719  ax-7 1739  ax-10 1786  ax-11 1791  ax-12 1803  ax-13 1968  ax-ext 2445  ax-sep 4568

This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-tru 1382  df-ex 1597  df-nf 1600  df-sb 1712  df-clab 2453  df-cleq 2459  df-clel 2462  df-nfc 2617  df-ral 2819  df-rab 2823  df-v 3115  df-in 3483  df-ss 3490  df-se 4839

This theorem is referenced by:  seeq2  4852  wereu2  4876  frmin  28899  wfrlem5  28924  frrlem5  28968