FORTY years have elapsed since the appearance of Prof. De Morgan's “Elements of Arithmetic,” at a time when perhaps few teachers, as they submitted the rules of the science to their pupils, cared to ...

Everyone knows that arithmetic is true: 2 + 2 = 4. But surprisingly, we don’t know why it’s true. By stepping outside the box of our usual way of thinking about numbers, my colleagues and I have ...

“NUMBER,” infers “Recorde,” in his “Whetstone of Witte,” “is the onelie thing (almost) that seperateth man from beastes. Hee therefore that shall contempne numbre, he declareth himselfe as brutishe as ...