Weekly Scheduled Maintenance Notice This blog is temporarily unavailable as we perform our regularly scheduled weekly maintenance. These updates are part of our ongoing effort to ensure the platform remains stable, secure, and performant for all users. During this maintenance window, you may experience intermittent disruptions in access, including delaysRead More →
Though the chart starts out in alphabetical order, there's a break in the pattern that offers a clue... Puzzling Like the Seventeenth Century Ursula Whitcher Mathematical Reviews (AMS) The following chart is taken from the second edition of a German-language arithmetic textbook by Anton Schultze. It was published in LiegnitzRead More →
You could pick up the torus and rotate it horizontally, as though you are taking the lid off of a jar of peanut butter... How to Untwist Your Fractions Diana Davis Phillips Exeter Academy A string around a bagel Here's the problem: your bagel has a torus knot wrapped aroundRead More →