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Theorem alsralrex 17061
Description: The general "all some" quantifier with class membership as its antecedent holds if and only if  ph holds for every  x in  A and some  x in  A satisfies  ph. (Contributed by Peter Mazsa, 27-Nov-2018.) (Revised by David A. Wheeler, 20-Jul-2026.)
Assertion
Ref Expression
alsralrex  |-  ( A.E. x ( x  e.  A  ->  ph )  <->  ( A. x  e.  A  ph  /\  E. x  e.  A  ph ) )
Distinct variable group:    x, A
Allowed substitution hint:    ph( x)

Proof of Theorem alsralrex
StepHypRef Expression
1 df-als 17036 . . 3  |-  ( A.E. x ( x  e.  A  ->  ph )  <->  ( A. x ( x  e.  A  ->  ph )  /\  E. x  x  e.  A
) )
2 df-ral 2533 . . . . 5  |-  ( A. x  e.  A  ph  <->  A. x
( x  e.  A  ->  ph ) )
32bicomi 132 . . . 4  |-  ( A. x ( x  e.  A  ->  ph )  <->  A. x  e.  A  ph )
43anbi1i 462 . . 3  |-  ( ( A. x ( x  e.  A  ->  ph )  /\  E. x  x  e.  A )  <->  ( A. x  e.  A  ph  /\  E. x  x  e.  A
) )
51, 4bitri 184 . 2  |-  ( A.E. x ( x  e.  A  ->  ph )  <->  ( A. x  e.  A  ph  /\  E. x  x  e.  A
) )
6 r19.2m 3614 . . . . 5  |-  ( ( E. x  x  e.  A  /\  A. x  e.  A  ph )  ->  E. x  e.  A  ph )
76expcom 116 . . . 4  |-  ( A. x  e.  A  ph  ->  ( E. x  x  e.  A  ->  E. x  e.  A  ph ) )
8 rexm 3627 . . . . 5  |-  ( E. x  e.  A  ph  ->  E. x  x  e.  A )
98a1i 9 . . . 4  |-  ( A. x  e.  A  ph  ->  ( E. x  e.  A  ph 
->  E. x  x  e.  A ) )
107, 9impbid 129 . . 3  |-  ( A. x  e.  A  ph  ->  ( E. x  x  e.  A  <->  E. x  e.  A  ph ) )
1110pm5.32i 458 . 2  |-  ( ( A. x  e.  A  ph 
/\  E. x  x  e.  A )  <->  ( A. x  e.  A  ph  /\  E. x  e.  A  ph ) )
125, 11bitri 184 1  |-  ( A.E. x ( x  e.  A  ->  ph )  <->  ( A. x  e.  A  ph  /\  E. x  e.  A  ph ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105   A.wal 1400   E.wex 1545    e. wcel 2209   A.wral 2528   E.wrex 2529   A.E.wals 17034
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587
This theorem depends on definitions:  df-bi 117  df-clel 2234  df-ral 2533  df-rex 2534  df-als 17036
This theorem is referenced by:  ralals  17063  rexals  17064
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