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From: Heiko Oberdiek <oberdiek@RUF.UNI-FREIBURG.DE>
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Subject:      Re: specials and vertical space
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At 11:29 16.09.1999 -0400, Mark Steinberger wrote:
>I've noticed that inclusion of hypertex \specials can affect vertical
>space. E.g., including the \specials immediately before an equation
>environment sometimes adds space above the environment.

Do you mean hyperref? Which version do you mean? The newest version
tries to restore the value of \lastskip. That was one cause for
different vertical spacing.

  http://www.tug.org/applications/hyperref/hyperref.zip (6.66e)

Yours sincerely
  Heiko <oberdiek@ruf.uni-freiburg.de>