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Theorem r19.23t 2728
Description: Closed theorem form of r19.23 2729. (Contributed by NM, 4-Mar-2013.) (Revised by Mario Carneiro, 8-Oct-2016.)
Assertion
Ref Expression
r19.23t  F/

Proof of Theorem r19.23t
StepHypRef Expression
1 19.23t 1800 . 2  F/
2 df-ral 2619 . . 3
3 impexp 433 . . . 4
43albii 1566 . . 3
52, 4bitr4i 243 . 2
6 df-rex 2620 . . 3
76imbi1i 315 . 2
81, 5, 73bitr4g 279 1  F/
Colors of variables: wff setvar class
Syntax hints:   wi 4   wb 176   wa 358  wal 1540  wex 1541   F/wnf 1544   wcel 1710  wral 2614  wrex 2615
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-11 1746
This theorem depends on definitions:  df-bi 177  df-an 360  df-ex 1542  df-nf 1545  df-ral 2619  df-rex 2620
This theorem is referenced by:  r19.23  2729  rexlimd2  2736
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