Elementi della cometa 1911 c (Brooks)

c ○ SAIt 2008 Memorie della

We present constraints on the values of Ωm, n, σ8, obtained from measurements of the Xray luminosity function of galaxy clusters as compiled in EMSS, RDCS and BCS galaxy cluster samples. The values obtained Ωm = 0.25+0.15 −0.05, n = −1 +0.05 −0.05, and σ8 = 0.8 +0.1 −0.1 are in agreement with WMAP data. We then put constraints on the quoted parameters and the dark-energy equation-of-state param...

Brooks' Theorem and Beyond

We collect some of our favorite proofs of Brooks’ Theorem, highlighting advantages and extensions of each. The proofs illustrate some of the major techniques in graph coloring, such as greedy coloring, Kempe chains, hitting sets, and the Kernel Lemma. We also discuss standard strengthenings of vertex coloring, such as list coloring, online list coloring, and Alon–Tarsi orientations, since analo...

Books in Running Brooks

Maclyn McCarty (1911–2005)

The editorial board lost a real soul mate when Maclyn McCarty passed away on January 2nd at age 93. While attending the theater with friends, one of the many activities that he enjoyed, he collapsed. “Dr. Mac” was revered worldwide for his remarkable experiments that led to the identification of DNA as the genetic material. This totally unanticipated discovery, and the revolutionary 1944 paper ...

Simon Flexner, 1911