These lyrics are to be sung to the tune of ‘Circles’ by Soul Coughing. They refer to the proposition that we use tau (τ) defined as 2π, instead of pi (π), counterarguments to that, and neverending friendly rivalries about it.

When you were younger you were taught a circle formula
That its perimeter is πd, that is, 2πr
πd gets you all round the circle
All around the circle, all around the circle
All around it
πr’s just halfway round the circle
Halfway round the circle, halfway round the circle
Halfway round it

And now you’re older, there are folks attempting to convince
That 2π’s τ and you should use it for circumference
τr gets you all around the circle
All around the circle, all around the circle
All around it
πr’s just halfway round the circle
Halfway round the circle, halfway round the circle
Halfway round it

Pi-tau-pi-tau-pi
Am I coming or going?
Tau-pi-tau-pi-tau
Am I halving or doubling?
Pi-tau-pi-tau-pi
Am I coming or going?
Tau-pi-tau-pi-tau
Am I halving or doubling?

But I can’t find out what’s the area
It was πr-squared, and now, τr squared on two
τ is now twice, π can do everything
Change it to τr, and complicate the formula

πr-squared is all around the circle
All around the circle, all around the circle
All around it
τr-squared’s twice around the circle
Twice around the circle, twice around the circle
Twice around it.

This row*’s just going round in circles (*with ‘row’ rhyming with ‘cow’, meaning ‘fight’)
Going round in circles, going round in circles
Round and round them…

(repeat entire song indefinitely)

I was not familiar with the original song, but we saw Holy Bongwater perform Nurples at FuMPFest 2024, and when I found out it was a parody of a song about circles, I knew what I had to do. I was motivated to finally finish it by a deadline for a maths music feedback group with a group of people I know from MathsJam. There were a few suggestions, but nothing that stood out as being a definite improvement — it was π of one, half a τ of the other, really. So I’ll put the lyrics here, and you’re welcome to sing them or change them as you see fit. They’ll likely be sung at MathsJamJam this year, perhaps along with This Tiling Never Repeats, which wasn’t sung last year because not enough people were familiar with the tune (and it’s a little harder to get the hang of than this one.)

In other news, after watching Star Trek: The Next Generation, Joey and I watched all of Lower Decks, and have got several seasons through Deep Space Nine. I now know that the combadge I put on my Star-Trek-like dress (which most closely resembles Starfleet cadet uniforms and Deep Space Nine uniforms) is only used for the first two seasons of Deep Space Nine, so the person who told me I had the wrong combadge for the dress was probably thinking of later seasons of DS9.

Since my last post I finished Advent of Code 2024 (which it turns out does not necessarily get more difficult each day, but does continue to be fun and somewhat nerdsnipy), did some more LeetCode exercises, did the final round of interviews for the job that had recommended practising with LeetCode, and did not get the job. So, I’m still looking, but now I feel pretty well prepared for most kinds of interview that could come my way. Meanwhile, I’ve started making a new multiplatform (iOS/macOS) app that a friend of mine always wanted to exist. A very rough, but functional, version of it is on TestFlight already. If you are a big Reddit user, and especially if you are also blind or visually impaired, you might want to try it, but please be aware it is in the early stages and there are many things I already plan to improve.

I have also uploaded a video from when we arrived in New York on the Queen Mary 2. I’m currently doing some light editing on a video from when we left Southampton, which I had forgotten I filmed. As mentioned previously, I still have more videos of my move to edit. On the more practical side, I’ve finished unpacking all my boxes, and filled my shiny new bookcases with books, and my new CD/DVD racks with CDs, DVDs, and also books.