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Theorem 2reu2rex 27961
Description: Double restricted existential uniqueness, analogous to 2eu2ex 2217. (Contributed by Alexander van der Vekens, 25-Jun-2017.)
Assertion
Ref Expression
2reu2rex  |-  ( E! x  e.  A  E! y  e.  B  ph  ->  E. x  e.  A  E. y  e.  B  ph )
Distinct variable groups:    y, A    x, y    x, B
Allowed substitution hints:    ph( x, y)    A( x)    B( y)

Proof of Theorem 2reu2rex
StepHypRef Expression
1 reurex 2754 . 2  |-  ( E! x  e.  A  E! y  e.  B  ph  ->  E. x  e.  A  E! y  e.  B  ph )
2 reurex 2754 . . 3  |-  ( E! y  e.  B  ph  ->  E. y  e.  B  ph )
32reximi 2650 . 2  |-  ( E. x  e.  A  E! y  e.  B  ph  ->  E. x  e.  A  E. y  e.  B  ph )
41, 3syl 15 1  |-  ( E! x  e.  A  E! y  e.  B  ph  ->  E. x  e.  A  E. y  e.  B  ph )
Colors of variables: wff set class
Syntax hints:    -> wi 4   E.wrex 2544   E!wreu 2545
This theorem is referenced by:  2reu1  27964
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-ral 2548  df-rex 2549  df-reu 2550  df-rmo 2551
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