Helping the Beaver

Beaver in the liver

A 60-year-old woman with a congenital solitary right kidney presented with 1 month history of right flank pain associated with hematuria and urinary tract infection (UTI) symptoms. A Computed tomography (CT) was done in view of the precious kidney, and revealed features suggestive of right obstructive uropathy with pyelonephritis; for which appropriate treatment was subsequently instituted. Inc...

Attacking the Busy Beaver 5

Since T. Rado in 1962 defined the busy beaver game several approaches have used computer technology to search busy beavers or even compute special values of Σ. Σ(5) is not yet known. A new approach to the computation of Σ(5) is presented, together with preliminary results, especially Σ(5)≥4098. This approach includes techniques to reduce the number of inspected Turing machines, to accelerate si...

Busy Beaver - The Influence of Representation

The Busy Beaver is an interesting theoretical problem proposed by Rado in 1962, in the context of the existence of non computable functions. In this paper we propose an evolutionary approach to this problem. We will focus on the representational issues, proposing alternative ways of codifying and interpreting Turing Machines, designed to take advantage of the existence of sets of equivalent Tur...

Edocation as a faktor helping the spread of eslam

The Busy Beaver Competition: a historical survey

Tibor Rado defined the Busy Beaver Competition in 1962. He used Turing machines to give explicit definitions for some functions that are not computable and grow faster than any computable function. He put forward the problem of computing the values of these functions on numbers 1, 2, 3, . . .. More and more powerful computers have made possible the computation of lower bounds for these values. ...