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Theorem exrot4 1853
Description: Rotate existential quantifiers twice. (Contributed by NM, 9-Mar-1995.)
Assertion
Ref Expression
exrot4

Proof of Theorem exrot4
StepHypRef Expression
1 excom13 1851 . . 3
21exbii 1667 . 2
3 excom13 1851 . 2
42, 3bitri 249 1
Colors of variables: wff setvar class
Syntax hints:  <->wb 184  E.wex 1612
This theorem is referenced by:  elvvv  5064  dfoprab2  6343  xpassen  7631  5oalem7  26578  elfuns  29565
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-11 1842
This theorem depends on definitions:  df-bi 185  df-ex 1613
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