# Wrong, But Useful, Episode 73

In this month's episode of Wrong, But Useful, we talk to @AJMagicMessage, who is Andrew Jeffrey in real life, and one of the driving forces behind Maths Week England, which in 2019 is November 11th to 15th.

Apologies for a few issues with feedback in this episode. Dave takes full responsibility.

We discuss:

• Number of the Podcast: 1089
• How to get involved in Maths Week England
• Game Theory (especially isomorphic games) and ncase.me/trust (via @LorHRL Hannah)
• Reading: @benorlin’s Math[s] with Bad Drawings and @robeastaway’s Maths on the Back of an Envelope.
• Via @robeastaway: further thoughts on rounding
• Via @peterrowlett: problem-solving in the new A-level
• Should you tie your shoes on the travelator, or on a standard walkway?
• Shorts:
• Big MathsJam bookings
• Via @octonion (Christopher D Long): "I'm also curious if Haken and Appel's original computer code for the Four Color Theorem from 1972 is still available, and if it can be run on modern hardware. It'd be a sadly missed opportunity for scientific history if it were somehow lost."
• Carnival of mathematics 175
• Puzzle feedback: Late solution to the square-colouring puzzle, from Sam Steele, our favourite Antipodean listener in Carrum Downs, Australia. No answers to the pillar problem yet.
• New puzzle: (via @cshearer41) Find the sum of the infinite series $\frac{1}{2} + \frac{1}{4} + \frac{2}{8} + \frac{3}{16} + \frac{5}{32} + \frac{8}{64} + \frac{13}{128} + \dots$ (i.e. Fibonacci on the top and powers of 2 on the bottom).

Next month is the Big MathsJam special!

* Edited 2019-11-08 to fix LaTeX

## Colin

Colin is a Weymouth maths tutor, author of several Maths For Dummies books and A-level maths guides. He started Flying Colours Maths in 2008. He lives with an espresso pot and nothing to prove.

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