Category Archives: problems and puzzles

Notes from JMM 2018

The annual Joint Mathematics Meeting always charges my batteries. Here are few items from this year’s gathering in San Diego. A Formal Affair In 1994 a document called the QED Manifesto made the rounds of certain mathematical mailing lists and … Continue reading

Posted in mathematics, problems and puzzles | 3 Comments

Counting Your Chickens Before They’re Pecked

It started with a brief story in the New York Times about Luke Robitaille, a 13-year-old student from Euless, Texas, who won the Raytheon Mathcounts National Competition by correctly answering the following question: In a barn, 100 chicks sit peacefully … Continue reading

Posted in biology, computing, featured, mathematics, problems and puzzles, statistics | 8 Comments

The short arm of coincidence

James Tanton tosses off number theory problems the way John D. Rockefeller handed out dimes. I wrote about one of Tanton’s problems back in January. Then a few weeks ago this tweet about factorials and squares snagged my attention, and … Continue reading

Posted in computing, featured, mathematics, problems and puzzles | 14 Comments

The uniqueness constraint

For the past few weeks the Sunday New York Times has been publishing a puzzle called Capsules, devised by Wei-Hwa Huang. Here are the instructions: Place numbers in the grid so that each outlined region contains the numbers 1 to … Continue reading

Posted in problems and puzzles | 17 Comments

A Tantonalizing Problem

In times like these one craves distraction, or maybe anaesthesia. On the whole, mathematics is better for you than ethanol, and you can even do it while driving. So in spare moments I’ve been noodling away at the following problem, … Continue reading

Posted in mathematics, problems and puzzles | 8 Comments