Mathematical Society, February 10.-Sir Joseph Larmor, president, in the chair.-J. H. Grace: (i) Theorems on straight lines intersecting at right angles, (ii) The classification of rational ...

When my students grow too dependent on their calculators, I ask them to find a number that, when multiplied by itself, gives them 2. Students quickly see that since 1² = 1 and 2² = 4, the answer has ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...