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Theorem pm11.53 1893
Description: Theorem *11.53 in [WhiteheadRussell] p. 164. (Contributed by Andrew Salmon, 24-May-2011.)
Assertion
Ref Expression
pm11.53
Distinct variable groups:   ,   ,
Allowed substitution hints:   ()   ()

Proof of Theorem pm11.53
StepHypRef Expression
1 19.21v 1890 . . 3
21albii 1566 . 2
3 nfv 1619 . . . 4  F/
43nfal 1842 . . 3  F/
5419.23 1801 . 2
62, 5bitri 240 1
Colors of variables: wff setvar class
Syntax hints:   wi 4   wb 176  wal 1540  wex 1541
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746
This theorem depends on definitions:  df-bi 177  df-ex 1542  df-nf 1545
This theorem is referenced by: (None)
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