April 14, 2012
This paper has been withdrawn by the author due to an error in the proof of Theorem 6.
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September 23, 2010
Major mistake. The paper has been withdrawn.
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This paper has been withdrawn.
January 29, 2014
This is a survey of some of Erd\H os's work on bases in additive number theory.
December 6, 2010
This paper has been withdrawn by the author due to an erro thereon line -2 of page 4.
March 1, 2008
This paper has been withdrawn by the author due to an uninteresting calculation.
March 11, 2009
This paper has been withdrawn by the author for further investigation.
July 1, 2008
This paper has been withdrawn by the author, due to a mistake on page 29.
June 26, 2003
This paper was withdrawn by the authors. The mistake in math.AG/0209223 affects also this paper.
February 3, 2009
This paper has been withdrawn by the author, due to a crucial error in page 5.
July 27, 2005
This paper has been withdrawn