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Theorem 2nalexn 1573
Description: Part of theorem *11.5 in [WhiteheadRussell] p. 164. (Contributed by Andrew Salmon, 24-May-2011.)
Assertion
Ref Expression
2nalexn

Proof of Theorem 2nalexn
StepHypRef Expression
1 df-ex 1542 . . 3
2 alex 1572 . . . 4
32albii 1566 . . 3
41, 3xchbinxr 302 . 2
54bicomi 193 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wb 176  wal 1540  wex 1541
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-5 1557
This theorem depends on definitions:  df-bi 177  df-ex 1542
This theorem is referenced by:  spc2gv  2942
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