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Theorem riinerm 6574
Description: The relative intersection of a family of equivalence relations is an equivalence relation. (Contributed by Mario Carneiro, 27-Sep-2015.)
Assertion
Ref Expression
riinerm  |-  ( ( E. y  y  e.  A  /\  A. x  e.  A  R  Er  B )  ->  (
( B  X.  B
)  i^i  |^|_ x  e.  A  R )  Er  B )
Distinct variable groups:    x, A    x, B    y, A
Allowed substitution hints:    B( y)    R( x, y)

Proof of Theorem riinerm
Dummy variable  a is distinct from all other variables.
StepHypRef Expression
1 iinerm 6573 . 2  |-  ( ( E. y  y  e.  A  /\  A. x  e.  A  R  Er  B )  ->  |^|_ x  e.  A  R  Er  B )
2 eleq1 2229 . . . . . 6  |-  ( x  =  a  ->  (
x  e.  A  <->  a  e.  A ) )
32cbvexv 1906 . . . . 5  |-  ( E. x  x  e.  A  <->  E. a  a  e.  A
)
4 eleq1 2229 . . . . . 6  |-  ( a  =  y  ->  (
a  e.  A  <->  y  e.  A ) )
54cbvexv 1906 . . . . 5  |-  ( E. a  a  e.  A  <->  E. y  y  e.  A
)
63, 5bitri 183 . . . 4  |-  ( E. x  x  e.  A  <->  E. y  y  e.  A
)
7 erssxp 6524 . . . . . . 7  |-  ( R  Er  B  ->  R  C_  ( B  X.  B
) )
87ralimi 2529 . . . . . 6  |-  ( A. x  e.  A  R  Er  B  ->  A. x  e.  A  R  C_  ( B  X.  B ) )
9 riinm 3938 . . . . . 6  |-  ( ( A. x  e.  A  R  C_  ( B  X.  B )  /\  E. x  x  e.  A
)  ->  ( ( B  X.  B )  i^i  |^|_ x  e.  A  R
)  =  |^|_ x  e.  A  R )
108, 9sylan 281 . . . . 5  |-  ( ( A. x  e.  A  R  Er  B  /\  E. x  x  e.  A
)  ->  ( ( B  X.  B )  i^i  |^|_ x  e.  A  R
)  =  |^|_ x  e.  A  R )
11 ereq1 6508 . . . . 5  |-  ( ( ( B  X.  B
)  i^i  |^|_ x  e.  A  R )  = 
|^|_ x  e.  A  R  ->  ( ( ( B  X.  B )  i^i  |^|_ x  e.  A  R )  Er  B  <->  |^|_
x  e.  A  R  Er  B ) )
1210, 11syl 14 . . . 4  |-  ( ( A. x  e.  A  R  Er  B  /\  E. x  x  e.  A
)  ->  ( (
( B  X.  B
)  i^i  |^|_ x  e.  A  R )  Er  B  <->  |^|_ x  e.  A  R  Er  B )
)
136, 12sylan2br 286 . . 3  |-  ( ( A. x  e.  A  R  Er  B  /\  E. y  y  e.  A
)  ->  ( (
( B  X.  B
)  i^i  |^|_ x  e.  A  R )  Er  B  <->  |^|_ x  e.  A  R  Er  B )
)
1413ancoms 266 . 2  |-  ( ( E. y  y  e.  A  /\  A. x  e.  A  R  Er  B )  ->  (
( ( B  X.  B )  i^i  |^|_ x  e.  A  R )  Er  B  <->  |^|_ x  e.  A  R  Er  B
) )
151, 14mpbird 166 1  |-  ( ( E. y  y  e.  A  /\  A. x  e.  A  R  Er  B )  ->  (
( B  X.  B
)  i^i  |^|_ x  e.  A  R )  Er  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104    = wceq 1343   E.wex 1480    e. wcel 2136   A.wral 2444    i^i cin 3115    C_ wss 3116   |^|_ciin 3867    X. cxp 4602    Er wer 6498
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 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-pow 4153  ax-pr 4187
This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ral 2449  df-rex 2450  df-v 2728  df-un 3120  df-in 3122  df-ss 3129  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-iin 3869  df-br 3983  df-opab 4044  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-er 6501
This theorem is referenced by: (None)
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