### Wrong, But Useful

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#### Latest Episodes

Wrong, but Useful: Episode 80/80

In this, the final episode of WBU, @reflectivemaths and I discuss: @samuel_hansen's antiracism post((get well soon, Samuel)). Dave and I both assert that Black Lives Matter and acknowledge that we have a significant amount of work to do to create a just society. In a whiplash-inducing change of tone, tooth fairy maths Multiplayer Nim (‘unlucky 10’) The Million Game from @drewfoster Dave seems to have a thing about noughts and crosses The Mathoff is over: thanks, everyone! Now, more than ever, would a decent text book be the answer? The chaos game in a hexagon Social distancing in 3D Via […]

Wrong, But Useful: Episode 79

In this, the penultimate episode of Wrong, But Useful, we’re joined by @karenshancock (who is Karen Hancock in real life). We discuss: A scoring system for an online quiz round. The Big Mathoff What is a surd? Currently reading Ratio by Michael Ruhlman - a cookery book that starts from the principles Some Noughts and Crosses variants https://twitter.com/mburnsmath/status/1248330254281662464 www.marilynburnsmathblog.com/five-twists-on-tic-tac-toe/ nrich.maths.org/1199 Core maths festival (via @mathsTechnology/Tom Button) For any given cubic if a line intersects it at three points then the sum of the x-coordinates of these points will be constant. An infinite monkey music bot A fractal Odds and Evenings […]

Wrong, But Useful: Episode 78

In episode 78 of Wrong, But Useful, we're joined by @c0mplexnumber, who is Clarissa Grandi in real life. This month, we discuss: Clarissa's Artful maths books, available via Tarquin - the activity book and the teacher's guide Number of the podcast: $\phi$ (and 3D maths) @anniek_p's #mathartchallenge Aperiodical’s big math-off is live! Also the stickerbook Rabbits and elephants Super-rectangles (via Peter Rowlett): Maths to get you through lockdown COVID-19 and Bayes's theorem Supermarket 2m distancing/route planning Richard Guy (103 1/2) and John Conway (82) have died. Casio calculator emulators now free Probability Question from an American Maths challenge (via Peter […]

Wrong, But Useful: Episode 77

In this month's Pi Day Special episode, we're joined by @aap03102, who is Chris Smith in real life. We discuss: Negative primes Surdoku (look in issue $2^5$) Chris's dark past Chalkdust book of the year Book (or writing) ideas (I’m trying to compile a big list of maths things I - or anyone - could write about. If you have such an idea, let me know and I’ll stick it on the list.) Chris's Pi Day antics Katherine Johnson has died, aged 101 A COVID-19 lesson plan and dataviz. Distance-time graphs * Edited 2020-03-14: To subscribe to Chris's maths newsletter, […]

Wrong, but Useful: Episode 76b

What's this? Didn't we have a WBU last week? We did indeed. Only we cut out a section of our conversation with @dr_teeluck about APR to keep the episode length (somewhat) reasonable. Here it is as a special bonus episode for your enjoyment.

Wrong, But Useful: Episode 76

In this episode of Wrong, But Useful, we’re joined by @dr_teeluck, who is Dr Vijay Teeluck in real life. We discuss: sunrise (posts by @colinthemathmo and by me got the same answer, someone else disagrees, nice thing to explore) favourite numbers a lovely post by @samhartburn about tetrahedra fitting through each other bridges (why are the bricks not parallel with the road?) The R0 value of the coronavirus Internet once again astonished that multiplication commutes Perfect espresso formula In communicate the bloody thing properly news: $|-1|-2|-3|$ thread here “Ten times greater” “Ten times smaller” Zero point seventy-five per cent via […]

Wrong, but Useful: Episode 75

In episode 75 of Wrong, but Useful, we talk with @astrastefania, who is Stefania Delprete in real life. We discuss: Dreams about Maths and doing Maths in lucid dreams Goodreads maths reading challenge Newsletters I like: Stuff Evelyn Wants You To Read by @evelynjlamb and and Fair Warning by @SophieWarnes Is a parallelogram a trapezium? (via @cshearer41) via @jamesgrime: The bullseye illusion RI Christmas lectures with @fryrsquared How do you describe Confidence Intervals? How damaging is to say “I’m 95% sure that mu is between ‘here’ and ‘here’ “? We reference The Maths of Life and Death. via @MrShepherd Maths […]

Wrong, But Useful, Episode 74

It’s time for the @BigMathsJam Wrong, But Useful! @stecks (Katie Steckles): Brouwer’s Fixed Point Theorem: “they said it’s a theorem, so I’ve got to believe it.” Mentions @jamesgrime. @christianp (Christian Lawson-Perfect): ordering cards to generate a fractal sequence. @peterrowlett (Peter Rowlett): transforming numbers problems into graphs. Mentions @alexcorner and @wtgowers. The puzzle is stated here and the discussion thread is here. @dragon_dodo (Dominika Vasilkova): the Weierstrass function @scroggs (Matthew Scroggs): @oddsandevens’s fractional origami. Yuen Ng: Miscancelling fractions @pecnut (Adam Townsend): @astrastefania’s redesign of the the musical stave. @smokeyfurby and his handler (Belgin) enjoyed @samhartburn’s cake, based on @becky_k_warren’s Big Math-Off […]

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 […]

Wrong, But Useful: Episode 72

In this month's podcast, we're joined by @CoreMathsCat, who is Catherine van Sarloos in real life. We discuss: Number of the Podcast: 179 (balloons) Maths Week England is mid-November (11-16th). Catherine is involved in running a contest for it! Via Peter Rowlett: Women’s names Via Adam Atkinson: rounding up or rounding away from zero or rounding to even? Reading books: we're all getting our teeth into Rob Eastaway's Maths On The Back Of An Envelope and Kit Yates's Maths Of Life And Death. Cat is also reading Invisible Women by Caroline Criado Perez. The Pink Tax How much does nursery […]

#### Latest Episodes

Wrong, but Useful: Episode 80/80

In this, the final episode of WBU, @reflectivemaths and I discuss: @samuel_hansen's antiracism post((get well soon, Samuel)). Dave and I both assert that Black Lives Matter and acknowledge that we have a significant amount of work to do to create a just society. In a whiplash-inducing change of tone, tooth fairy maths Multiplayer Nim (‘unlucky 10’) The Million Game from @drewfoster Dave seems to have a thing about noughts and crosses The Mathoff is over: thanks, everyone! Now, more than ever, would a decent text book be the answer? The chaos game in a hexagon Social distancing in 3D Via […]

Wrong, But Useful: Episode 79

In this, the penultimate episode of Wrong, But Useful, we’re joined by @karenshancock (who is Karen Hancock in real life). We discuss: A scoring system for an online quiz round. The Big Mathoff What is a surd? Currently reading Ratio by Michael Ruhlman - a cookery book that starts from the principles Some Noughts and Crosses variants https://twitter.com/mburnsmath/status/1248330254281662464 www.marilynburnsmathblog.com/five-twists-on-tic-tac-toe/ nrich.maths.org/1199 Core maths festival (via @mathsTechnology/Tom Button) For any given cubic if a line intersects it at three points then the sum of the x-coordinates of these points will be constant. An infinite monkey music bot A fractal Odds and Evenings […]

Wrong, But Useful: Episode 78

In episode 78 of Wrong, But Useful, we're joined by @c0mplexnumber, who is Clarissa Grandi in real life. This month, we discuss: Clarissa's Artful maths books, available via Tarquin - the activity book and the teacher's guide Number of the podcast: $\phi$ (and 3D maths) @anniek_p's #mathartchallenge Aperiodical’s big math-off is live! Also the stickerbook Rabbits and elephants Super-rectangles (via Peter Rowlett): Maths to get you through lockdown COVID-19 and Bayes's theorem Supermarket 2m distancing/route planning Richard Guy (103 1/2) and John Conway (82) have died. Casio calculator emulators now free Probability Question from an American Maths challenge (via Peter […]

Wrong, But Useful: Episode 77

In this month's Pi Day Special episode, we're joined by @aap03102, who is Chris Smith in real life. We discuss: Negative primes Surdoku (look in issue $2^5$) Chris's dark past Chalkdust book of the year Book (or writing) ideas (I’m trying to compile a big list of maths things I - or anyone - could write about. If you have such an idea, let me know and I’ll stick it on the list.) Chris's Pi Day antics Katherine Johnson has died, aged 101 A COVID-19 lesson plan and dataviz. Distance-time graphs * Edited 2020-03-14: To subscribe to Chris's maths newsletter, […]

Wrong, but Useful: Episode 76b

What's this? Didn't we have a WBU last week? We did indeed. Only we cut out a section of our conversation with @dr_teeluck about APR to keep the episode length (somewhat) reasonable. Here it is as a special bonus episode for your enjoyment.

Wrong, But Useful: Episode 76

In this episode of Wrong, But Useful, we’re joined by @dr_teeluck, who is Dr Vijay Teeluck in real life. We discuss: sunrise (posts by @colinthemathmo and by me got the same answer, someone else disagrees, nice thing to explore) favourite numbers a lovely post by @samhartburn about tetrahedra fitting through each other bridges (why are the bricks not parallel with the road?) The R0 value of the coronavirus Internet once again astonished that multiplication commutes Perfect espresso formula In communicate the bloody thing properly news: $|-1|-2|-3|$ thread here “Ten times greater” “Ten times smaller” Zero point seventy-five per cent via […]

Wrong, but Useful: Episode 75

In episode 75 of Wrong, but Useful, we talk with @astrastefania, who is Stefania Delprete in real life. We discuss: Dreams about Maths and doing Maths in lucid dreams Goodreads maths reading challenge Newsletters I like: Stuff Evelyn Wants You To Read by @evelynjlamb and and Fair Warning by @SophieWarnes Is a parallelogram a trapezium? (via @cshearer41) via @jamesgrime: The bullseye illusion RI Christmas lectures with @fryrsquared How do you describe Confidence Intervals? How damaging is to say “I’m 95% sure that mu is between ‘here’ and ‘here’ “? We reference The Maths of Life and Death. via @MrShepherd Maths […]

Wrong, But Useful, Episode 74

It’s time for the @BigMathsJam Wrong, But Useful! @stecks (Katie Steckles): Brouwer’s Fixed Point Theorem: “they said it’s a theorem, so I’ve got to believe it.” Mentions @jamesgrime. @christianp (Christian Lawson-Perfect): ordering cards to generate a fractal sequence. @peterrowlett (Peter Rowlett): transforming numbers problems into graphs. Mentions @alexcorner and @wtgowers. The puzzle is stated here and the discussion thread is here. @dragon_dodo (Dominika Vasilkova): the Weierstrass function @scroggs (Matthew Scroggs): @oddsandevens’s fractional origami. Yuen Ng: Miscancelling fractions @pecnut (Adam Townsend): @astrastefania’s redesign of the the musical stave. @smokeyfurby and his handler (Belgin) enjoyed @samhartburn’s cake, based on @becky_k_warren’s Big Math-Off […]

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 […]

Wrong, But Useful: Episode 72

In this month's podcast, we're joined by @CoreMathsCat, who is Catherine van Sarloos in real life. We discuss: Number of the Podcast: 179 (balloons) Maths Week England is mid-November (11-16th). Catherine is involved in running a contest for it! Via Peter Rowlett: Women’s names Via Adam Atkinson: rounding up or rounding away from zero or rounding to even? Reading books: we're all getting our teeth into Rob Eastaway's Maths On The Back Of An Envelope and Kit Yates's Maths Of Life And Death. Cat is also reading Invisible Women by Caroline Criado Perez. The Pink Tax How much does nursery […]