It is not difficult to see that every group homomorphism from Z to R extends to a homomorphism from R to R. (Essentially, this is the fact that a linear transformation can be defined to have any desired action on a basis.) We will see other examples of discrete subgroups Γ of connected groups G, such that the homomorphisms defined on Γ can (“almost”) be extended to homomorphisms defined on all ...

Many mobile learning (m-learning) systems have been promising that they would supersede current classroom or computer-based learning activities. This paper takes an exception to that approach, arguing that the formality of future learning experiences that m-learning can present may not ensure this vision as they stand. Instead, we see other goodness-of-fit of mobile learning as complemental lea...

A systematic literature review of the educational needs assessment of general practitioners (GPs) is described. A total of 36 studies, based on the subject of educational needs in primary care, were identified. The methods of searching and the difficulties in identifying papers on the chosen subject are discussed. Although there is an extensive literature on the reporting of the perception of G...

Knowledge closure is, roughly, the following claim: For every agent S and propositions P and Q, if S knows P, knows that P implies Q, and believes Q because it is so implied, then S knows Q. Almost every epistemologist believes that closure is true. Indeed, they often believe that it so obviously true that any theory implying its denial is thereby refuted. Some prominent epistemologists have ne...

In today’s increasingly competitive business environment companies can, and indeed must, respond more rapidly to customers’ changing demands, desires, and preferences. In today’s information-rich environment customers can comparison shop, get product reviews from other customers, and, in general, become very well informed about what is available in the market. • If your offerings are not differ...

Many remote sensing applications are devoted to the agricultural sector. Representative case studies are presented in the special issue “Advances in Remote Sensing of Agriculture”. To complement the examples published within the special issue, a few main applications with regional to global focus were selected for this review, where remote sensing contributions are traditionally strong. The sel...

Wait. What? Often, we miss something that we wanted to see, hear, or feel— especially when there is a lot of information competing for our attention. We mostly notice this problem when we try to make the brain process lots of information at high speed. Imagine for instance that you are playing a video game and browsing the internet while checking text messages on your phone. Here, we look at ho...

303 The Rockefeller University Press $30.00 J. Cell Biol. Vol. 216 No. 2 303–304 https://doi.org/10.1083/jcb.201612078 A decade ago, apoptosis was assumed to be the exclusive mode of cellular demise that followed genetically determined signaling pathways. Today, however, we understand that in most pathophysiological circumstances, necrosis also represents a regulated process of cell death that ...