I've had at least two marketing emails today from companies suggesting I use their products to cheer myself up today but carefully not mentioning any particular calendar-based reason for doing so.

**Andrew 🔢** · Nov 06, 2019, 13:30

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**Formerly a Poster** @trickster@mastodon.technology · Nov 06, 2019, 13:30

Nov 06, 2019, 13:30

Formerly a Poster @trickster@mastodon.technology

so, how do you solve operator precedence? do you encode it in the grammar? do you use Pratt parsing? hell no

b948f4dd0d802e1a.png

**Andrew 🔢** · Nov 03, 2019, 15:38

Andrew 🔢 boosted

**JordiGH** @JordiGH@mathstodon.xyz · Nov 03, 2019, 15:38

Nov 03, 2019, 15:38

JordiGH @JordiGH@mathstodon.xyz

And another dumb joke, sorry, sorry

http://www.lefthandedtoons.com/1914/

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**Andrew 🔢** @andrewt@mathstodon.xyz · Oct 25, 2019, 15:44

**Andrew 🔢** @andrewt@mathstodon.xyz · Oct 25, 2019, 15:44

Oct 25, 2019, 15:44

Andrew 🔢 @andrewt@mathstodon.xyz

There's a great song lyric in the fact that anything to the power of love gives unity.

**Andrew 🔢** · Oct 14, 2019, 15:43

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**jsiehler** @jsiehler@mathstodon.xyz · Oct 14, 2019, 15:43

Oct 14, 2019, 15:43

jsiehler @jsiehler@mathstodon.xyz

@andrewt As if this weren't all confusing enough, I believe the set of points depicted here is what's technically known as collielinear.

c52ccf81d538f217.png?1571067807

**Andrew 🔢** · Oct 14, 2019, 12:56

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**jsiehler** @jsiehler@mathstodon.xyz · Oct 14, 2019, 12:56

Oct 14, 2019, 12:56

jsiehler @jsiehler@mathstodon.xyz

@andrewt It's the prefix col- which sometimes occurs in latin-derived words instead of co- or com- with base words that begin with an 'l'. You see it in "collateral" and "colloquial" and even in "college" and "collegial." That said, I think the one-l version, "colinear" is widely accepted as correct these days.

**Andrew 🔢** @andrewt@mathstodon.xyz · Oct 14, 2019, 10:51

**Andrew 🔢** @andrewt@mathstodon.xyz · Oct 14, 2019, 10:51

Oct 14, 2019, 10:51

Andrew 🔢 @andrewt@mathstodon.xyz

OK so today all the available evidence is telling me that the maths word for "on the same line" is "collinear" with two Ls and it's pronounced like it's spelled, like it's about Colin's ear, and just what the hell? I've been writing and saying "colinear" and just what is this?

**Andrew 🔢** @andrewt@mathstodon.xyz · Aug 20, 2019, 13:31

**Andrew 🔢** @andrewt@mathstodon.xyz · Aug 20, 2019, 13:31

Aug 20, 2019, 13:31

Andrew 🔢 @andrewt@mathstodon.xyz

update: it works with 3d rotation too: https://www.shadertoy.com/view/tljSRG

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**Andrew 🔢** @andrewt@mathstodon.xyz · Aug 20, 2019, 13:25

**Andrew 🔢** @andrewt@mathstodon.xyz · Aug 20, 2019, 13:25

Aug 20, 2019, 13:25

Andrew 🔢 @andrewt@mathstodon.xyz

Someone posted a gif of this effect on birdsite and I wanted to understand it so I've built it as a space-warping raymarcher.

Its some lovely maths that I think I *mostly* understand now:

https://www.shadertoy.com/view/3t2Xzy

**Andrew 🔢** @andrewt@mathstodon.xyz · Apr 20, 2019, 20:56

**Andrew 🔢** @andrewt@mathstodon.xyz · Apr 20, 2019, 20:56

Apr 20, 2019, 20:56

Andrew 🔢 @andrewt@mathstodon.xyz

A problem shared is equal to the sum of the problems on the other two sides.

**Andrew 🔢** · Mar 28, 2019, 15:39

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**Andrew 💻** @andrewt@mastodon.technology · Mar 28, 2019, 15:39

Mar 28, 2019, 15:39

Andrew 💻 @andrewt@mastodon.technology

Made a binary adder as well

https://www.youtube.com/watch?v=nuIv8fzxMtw

no idea why i do these things

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**Andrew 🔢** · Mar 27, 2019, 23:36

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**Andrew 💻** @andrewt@mastodon.technology · Mar 27, 2019, 23:36

Mar 27, 2019, 23:36

Andrew 💻 @andrewt@mastodon.technology

For some reason I have built Conway's Game of Life in Baba is You.

https://www.youtube.com/watch?v=YH0NR1kmMUo

**Andrew 🔢** · Mar 17, 2019, 23:04

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**will((i)a(m))** @will@catgirl.science · Mar 17, 2019, 23:04

Mar 17, 2019, 23:04

will((i)a(m)) @will@catgirl.science

@11011110 @andrewt fun fact. there's an exact formula for how many x,y satisfy x²+y²=n. it's 4 times (the number of factors of n of the form 4k+1 - the number of factors of n of the form 4k+3). another fun fact: this ties into the average being π through the Taylor expansion of arctan(1)=π/4

**Andrew 🔢** · Mar 15, 2019, 13:26

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**ColinTheMathmo** @ColinTheMathmo@mathstodon.xyz · Mar 15, 2019, 13:26

Mar 15, 2019, 13:26

ColinTheMathmo @ColinTheMathmo@mathstodon.xyz

My latest bloggy thing:

https://www.solipsys.co.uk/new/TheSidewaysTide.html?sc15m

As always, comments, thoughts, criticisms, and feedback, all welcome.

Have to say that this "one blog post per week" is a brutal schedule.

**Andrew 🔢** @andrewt@mathstodon.xyz · Mar 14, 2019, 13:33

**Andrew 🔢** @andrewt@mathstodon.xyz · Mar 14, 2019, 13:33

Mar 14, 2019, 13:33

Andrew 🔢 @andrewt@mathstodon.xyz

Also, here's a maths puzzle for π-day:

Adding the brackets from this Alex Bellos column https://www.theguardian.com/science/2019/mar/11/solve-it-can-you-speak-yoda-how-to to the numbers 1, 2, 3, 4 —

[1, 2] → 12
⟨1, 2⟩ → 21
⟨[⟨1, 2⟩, 3], 4⟩ → ⟨[21, 3], 4⟩ → ⟨213, 4⟩→ 4213

…we can make any number except 2413, and which other?

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**Andrew 🔢** @andrewt@mathstodon.xyz · Mar 14, 2019, 13:30

**Andrew 🔢** @andrewt@mathstodon.xyz · Mar 14, 2019, 13:30

Mar 14, 2019, 13:30

Andrew 🔢 @andrewt@mathstodon.xyz

I wrote a thing for the Aperiodical:

https://aperiodical.com/2019/03/buzz-in-when-you-think-you-know-the-answer/

**Andrew 🔢** @andrewt@mathstodon.xyz · Mar 08, 2019, 09:16

**Andrew 🔢** @andrewt@mathstodon.xyz · Mar 08, 2019, 09:16

Mar 08, 2019, 09:16

Andrew 🔢 @andrewt@mathstodon.xyz

This is a nice little trick but a bafflingly poor article. How can anyone write an entire article about a single tweet without having understood the tweet?
https://www.mirror.co.uk/news/weird-news/mans-brilliant-maths-trick-means-14099670