Search Results

You are looking at 1 - 4 of 4 items for :

  • Author or Editor: T. Bisgaard x
  • Mathematics and Statistics x
  • Refine by Access: All Content x
Clear All Modify Search

Abstract  

It is shown that there is a positive semidefinite two-sided two-dimensional sequence f, which is not a moment sequence, such that log f(2m,2n) =O(m 2 + n 2) as (m,n) →∞.

Restricted access

Abstract  

It has long been known that in order for a subsemigroup of Q +, properly containing {0}, to be perfect, it is necessary that it be non-C-finite. We define quasi-C-finite semigroups in such a way that it is necessary that the semigroup be non-quasi-C-finite. Every C-finite subsemigroup of Q + is quasi-C- finite, but there is a quasi-C-finite subsemigroup of Q + which is not C-finite.

Restricted access