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Electronic Colloquium on Computational Complexity

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Reports tagged with semirecursive:
TR95-036 | 5th July 1995
Richard Beigel, William Gasarch, Efim Kinber

Frequency Computation and Bounded Queries

For a set A and a number n let F_n^A(x_1,...,x_n) =
A(x_1)\cdots A(x_n). We study how hard it is to approximate this
function in terms of the number of queries required. For a general
set A we have exact bounds that depend on functions from coding
theory. These are applied ... more >>>

TR00-077 | 24th August 2000
Till Tantau

On the Power of Extra Queries to Selective Languages

Revisions: 1

A language is \emph{selective} if there exists a
selection algorithm for it. Such an algorithm selects
from any two words one, which is an element of the
language whenever at least one of them is.
Restricting the complexity of selection algorithms
yields different \emph{selectivity classes} ... more >>>

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