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 ...

Playing with arithmetic can lead us to unexpected and profound discoveries that point toward deeper mathematics and sometimes even deeper science. We solved our last Insights puzzle by performing some ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. The title of this bound set of tables ...