for reading these notes, suggesting improvements and correcting my often
liberal use of English language and punctuation.
While working on these notes I benefited from the conversations with
Andrew Sommese, Stefan Stolz and Larry Taylor, who patiently answered
my sometimes clumsily formulated questions and helped clear the fog.
My wife has graciously accepted my long periods of quiet meditation or
constant babbling about gauge theory. She has been a constant source of
support in this endeavor. I want to thank my entire family for being there
Notre Dame, Indiana 1999