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Theorem sess1 4309
Description: Subset theorem for the set-like predicate. (Contributed by Mario Carneiro, 24-Jun-2015.)
Assertion
Ref Expression
sess1  |-  ( R 
C_  S  ->  ( S Se  A  ->  R Se  A
) )

Proof of Theorem sess1
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 simpl 108 . . . . . 6  |-  ( ( R  C_  S  /\  y  e.  A )  ->  R  C_  S )
21ssbrd 4019 . . . . 5  |-  ( ( R  C_  S  /\  y  e.  A )  ->  ( y R x  ->  y S x ) )
32ss2rabdv 3218 . . . 4  |-  ( R 
C_  S  ->  { y  e.  A  |  y R x }  C_  { y  e.  A  | 
y S x }
)
4 ssexg 4115 . . . . 5  |-  ( ( { y  e.  A  |  y R x }  C_  { y  e.  A  |  y S x }  /\  { y  e.  A  | 
y S x }  e.  _V )  ->  { y  e.  A  |  y R x }  e.  _V )
54ex 114 . . . 4  |-  ( { y  e.  A  | 
y R x }  C_ 
{ y  e.  A  |  y S x }  ->  ( {
y  e.  A  | 
y S x }  e.  _V  ->  { y  e.  A  |  y R x }  e.  _V ) )
63, 5syl 14 . . 3  |-  ( R 
C_  S  ->  ( { y  e.  A  |  y S x }  e.  _V  ->  { y  e.  A  | 
y R x }  e.  _V ) )
76ralimdv 2532 . 2  |-  ( R 
C_  S  ->  ( A. x  e.  A  { y  e.  A  |  y S x }  e.  _V  ->  A. x  e.  A  {
y  e.  A  | 
y R x }  e.  _V ) )
8 df-se 4305 . 2  |-  ( S Se  A  <->  A. x  e.  A  { y  e.  A  |  y S x }  e.  _V )
9 df-se 4305 . 2  |-  ( R Se  A  <->  A. x  e.  A  { y  e.  A  |  y R x }  e.  _V )
107, 8, 93imtr4g 204 1  |-  ( R 
C_  S  ->  ( S Se  A  ->  R Se  A
) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    e. wcel 2135   A.wral 2442   {crab 2446   _Vcvv 2721    C_ wss 3111   class class class wbr 3976   Se wse 4301
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 699  ax-5 1434  ax-7 1435  ax-gen 1436  ax-ie1 1480  ax-ie2 1481  ax-8 1491  ax-10 1492  ax-11 1493  ax-i12 1494  ax-bndl 1496  ax-4 1497  ax-17 1513  ax-i9 1517  ax-ial 1521  ax-i5r 1522  ax-ext 2146  ax-sep 4094
This theorem depends on definitions:  df-bi 116  df-tru 1345  df-nf 1448  df-sb 1750  df-clab 2151  df-cleq 2157  df-clel 2160  df-nfc 2295  df-ral 2447  df-rab 2451  df-v 2723  df-in 3117  df-ss 3124  df-br 3977  df-se 4305
This theorem is referenced by:  seeq1  4311
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