Theorem sess2 4808

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 3479	. . 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 3498	. . . . 5 |- ( A C_ B -> { y e. A | y R x } C_ { y e. B | y R x } )
3		ssexg 4542	. . . . . 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 441	. . . . 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 17	. . . 4 |- ( A C_ B -> ( { y e. B | y R x } e. _V -> { y e. A | y R x } e. _V ) )
6	5	ralimdv 2806	. . 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 4799	. 2 |- ( R Se B <-> A. x e. B { y e. B | y R x } e. _V )
9		df-se 4799	. 2 |- ( R Se A <-> A. x e. A { y e. A | y R x } e. _V )
10	7, 8, 9	3imtr4g 278	1 |- ( A C_ B -> ( R Se B -> R Se A ) )

Syntax hints:   -> wi 4   e. wcel 1904   A.wral 2756   {crab 2760   _Vcvv 3031   C_ wss 3390   class class class wbr 4395   Se wse 4796

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1677  ax-4 1690  ax-5 1766  ax-6 1813  ax-7 1859  ax-10 1932  ax-11 1937  ax-12 1950  ax-13 2104  ax-ext 2451  ax-sep 4518

This theorem depends on definitions:  df-bi 190  df-or 377  df-an 378  df-tru 1455  df-ex 1672  df-nf 1676  df-sb 1806  df-clab 2458  df-cleq 2464  df-clel 2467  df-nfc 2601  df-ral 2761  df-rab 2765  df-v 3033  df-in 3397  df-ss 3404  df-se 4799

This theorem is referenced by:  seeq2  4812  wereu2  4836  wfrlem5  7058  frmin  30551  frrlem5  30589