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Theorem 19.9t 1795
 Description: A closed version of 19.9 1799. (Contributed by NM, 5-Aug-1993.) (Revised by Mario Carneiro, 24-Sep-2016.) (Proof shortended by Wolf Lammen, 30-Dec-2017.)
Assertion
Ref Expression
19.9t

Proof of Theorem 19.9t
StepHypRef Expression
1 df-nf 1555 . . 3
2 19.9ht 1794 . . 3
31, 2sylbi 189 . 2
4 19.8a 1764 . 2
53, 4impbid1 196 1
 Colors of variables: wff set class Syntax hints:   wi 4   wb 178  wal 1550  wex 1551  wnf 1554 This theorem is referenced by:  19.9h  1796  19.9d  1798  19.9OLD  1800  19.21t  1815  19.23t  1820  19.23tOLD  1840  spimt  1958  sbft  2119  vtoclegft  3029 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1556  ax-5 1567  ax-17 1627  ax-9 1668  ax-8 1689  ax-6 1746  ax-11 1763 This theorem depends on definitions:  df-bi 179  df-ex 1552  df-nf 1555
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