More than the fonts have changed

After more than a decade, has pet guardianship changed anything?

Guidelines have done more harm than good.

Practice guidelines have proliferated in medicine but their impact on actual practice and outcomes is difficult, if not impossible, to quantify. Though guidelines are based largely on observational data and expert opinion, it is widely believed that adherence to them leads to improved outcomes. Data to support this belief simply does not exist. If guidelines are universally ignored, their impac...

You have more capital than you think.

Senior executives typically delegate the responsibility for managing a firm's derivatives portfolio to in-house financial experts and the company's financial advisers. That's a strategic blunder, argues this Nobel laureate, because the inventiveness of modern financial markets makes it possible for companies to double or even triple their capacity to invest in their strategic assets and compete...

Finite groups have even more centralizers

For a finite group $G$‎, ‎let $Cent(G)$ denote the set of centralizers of single elements of $G$‎. ‎In this note we prove that if $|G|leq frac{3}{2}|Cent(G)|$ and $G$ is 2-nilpotent‎, ‎then $Gcong S_3‎, ‎D_{10}$ or $S_3times S_3$‎. ‎This result gives a partial and positive answer to a conjecture raised by A‎. ‎R‎. ‎Ashrafi [On finite groups with a given number of centralizers‎, ‎Algebra‎ ‎Collo...

Transient ischemic attack: the rules have changed.

Bob: If you thought you knew what a transient ischemic attack (TIA) is, and how to evaluate for it, think again. This scientific statement snuck past a lot of us and its implications are far-reaching. The guideline includes three game changers for all physicians: • It revises the definition of TIA • It recommends that magnetic resonance imaging (MRI) be performed within 24 hours in patients pre...