Abstract. In this paper, the following problem is considered: does there exist a 𝑡-arc-transitive regular covering graph of an 𝑠-arc-transitive graph for positive integers 𝑡 greater than 𝑠? In ...

That's been the general contention of the media, which, as a public service, have explained at some length the basics of fast-growing quantities, such as disease, to hammer home how something like a ...

The manner in which patches are delineated in spatially realistic metapopulation models will influence the size, connectivity, and extinction and recolonization dynamics of those patches. Most ...