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Theorem pclem6 930
Description: Negation inferred from embedded conjunct. (Contributed by NM, 20-Aug-1993.) (Proof shortened by Wolf Lammen, 25-Nov-2012.)
Assertion
Ref Expression
pclem6

Proof of Theorem pclem6
StepHypRef Expression
1 ibar 504 . . 3
2 nbbn 358 . . 3
31, 2sylib 196 . 2
43con2i 120 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  <->wb 184  /\wa 369
This theorem is referenced by:  nalset  4589  pwnss  4617  bj-nalset  34380
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 185  df-an 371
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