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Features
In conversation with Robin Wilson
Ashleigh Wilcox and Ellen Jolley chat to the professor and maths communicator about books, the Open University and musicWinning Wythoff’s game
Molly Ireland presents a gambit which will impress your matesNotched edge cards
Joe Celko makes a database from card and knitting needlesOn the cover: Spirographs
Ashleigh Wilcox, Jenny Power and Rachel Evans show you how to draw pretty picturesEasy to state, hard to prove: The Collatz conjecture
90 years later, we're still unable to prove this surprisingly simple statementThe problem with addition
It doesn’t add up for Patrick CreaghA complex twist on triangles
Chris Sangwin uncovers the equation of a triangle using the power of complex numbersBorwein integrals
Aimen Khan ponders how patterns break downFerm-ant’s principle
Tyler Helmuth has lost his ant-vocadoPoly-π
Clem Padin calculates π, but not as we know itTreating the differential with discretion
Sophie Bleau explores the differential on Morseback.
Fun
Cryptic crossword, Issue 20
Can you solve it?A mathematician’s guide to Edinburgh
Stranded in Scotland's capital? This guide will keep you busyDear Dirichlet, Issue 20
Cricket, coursework and karaoke are among the problems solved in this issue's Dear Dirichlet agony aunt columnPrize crossnumber, Issue 20
Can you solve it?Top ten: top tens
The undisputed top ten top tens this seasonWhich animal are you?
Find out by using our simple flowchartDo you dress like a mathematical cliche?
Fashion fiend of fashion flop? Take our quiz to find outWhat’s hot and what’s not, Issue 20
Fashion is fleeting, Chalkdust regulars are not.The big argument: should we write another issue?
How much barrel is left to scrape?