"Stars on a clear night"

Elliptic stars in a chaotic night

A recurrent theme in the description of phase portraits of dynamical systems is that of elliptic islands in a chaotic sea. Usually this picture is invoked in the context of smooth twist maps of the annulus or the torus, like the standard map. In this setting ‘elliptic islands’ refers to the topological disks bounded by periodic smooth curves surrounding elliptic periodic points. Establishing th...

Unweighted p-center problem on extended stars

An extended star is a tree which has only one vertex with degree larger than two. The -center problem in a graph  asks to find a subset  of the vertices of  of cardinality  such that the maximum weighted distances from  to all vertices is minimized. In this paper we consider the -center problem on the unweighted extended stars, and present some properties to find solution.

On Divali Night

Up all night on a redeye flight

A protein called RYE has a central role in the regulation of sleep.

Night sweats

Although night sweating is a common outpatient complaint medical, literature on this subject is scarce. Tuberculosis, brucellosis and lymphoma are diseases in which night sweating is a dominant symptom, but these are infrequently found to be the cause of night sweats in modern practice. While these diseases remain important diagnostic considerations in patients with night sweats, other diagnosi...