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Essentialities in additive bases

Peter Hegarty (Institutionen för matematiska vetenskaper, matematik)
Proceedings of the American Mathematical Society (0002-9939). Vol. 137 (2009), 5, p. 1657-1661.
[Artikel, refereegranskad vetenskaplig]

Let A be an asymptotic basis for N_0 of some order. By an essentiality of A one means a subset P such that A\P is no longer an asymptotic basis of any order and such that P is minimal among all subsets of A with this property. A finite essentiality of A is called an essential subset. In a recent paper, Deschamps and Farhi asked the following two questions : (i) does every asymptotic basis of N_0 possess some essentiality ? (ii) is the number of essential subsets of size at most k of an asymptotic basis of order h bounded by a function of k and h only (they showed the number is always finite) ? We answer the latter question in the affirmative, and the former in the negative by means of an explicit construction, for every integer h >= 2, of an asymptotic basis of order h with no essentialities.

Denna post skapades 2008-10-13. Senast ändrad 2012-03-27.
CPL Pubid: 75261


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Institutionen för matematiska vetenskaper, matematik (2005-2016)


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