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Theorem alex 1647
Description: Theorem 19.6 of [Margaris] p. 89. (Contributed by NM, 12-Mar-1993.)
Assertion
Ref Expression
alex

Proof of Theorem alex
StepHypRef Expression
1 notnot 291 . . 3
21albii 1640 . 2
3 alnex 1614 . 2
42, 3bitri 249 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184  A.wal 1393  E.wex 1612
This theorem is referenced by:  exnal  1648  2nalexn  1649  alimex  1652  19.3v  1755  sp  1859  hba1  1896  exists2  2389  pm10.253  31267  vk15.4j  33298  vk15.4jVD  33714
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631
This theorem depends on definitions:  df-bi 185  df-ex 1613
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