ABSTRACT In order to discuss the temporal structure of mathematical research, this essay offers four related definitions of a mathematical object from different times and places. It is argued that in ...

William Heard Kilpatrick, one of the most influential pedagogical figures of the early twentieth century, would have felt right at home in today’s educational culture wars. Back then, as now, the ...

Cameron Carpenter plays the organ in a way you'll rarely hear in church. He travels with his instrument on a huge truck, and it takes a small team to set it up in concert halls around the world. A ...