I've got my A-to-Z for the year under way, with a bit of a career-biographical sketch if Michael Atiyah:

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My second A-to-Z topic for the year was the Butterfly Effect. Of course I slipped some comic strips into it.

My third A-to-Z topic was Complex Numbers. I've written about them before, so tried to think a bit about a different angle: why do we trust them?

The fourth of my A-to-Z topics was Delta. It's a big idea so I tried to trim it to two specific but not quite identical uses of the concept.

For my fifth A-to-Z topic, I got the suggestion of Exponential. I used the chance to work out a reason behind something we've gotten used to: why is the exponential of an imaginary number on the unit circle?

The sixth of my A-to-Z topics was Fibonacci. One of my readers hoped to learn a bit about Leonardo of Pisa's biography. This brought me to some amazing discoveries about Fibonacci's biography, and I share it here ...

For the eighth of this year's A-to-Z essays I wrote about Hilbert's Problems, and about a question adjacent to David Hilbert's famous list.

The ninth of my A-to-Z topics this year was Imaginary Numbers. Yes, I found the Peanuts strip where Sally Brown imagines "overly-eight".

Also the one where that plush tiger has some suggestions.

The tenth of the A-to-Z this year? Jacobi polynomials. I was thinking to just get every function ever covered in one article.

Can I explain K-Theory in two thousand words? No, no I can not. But in the eleventh of my A-to-Z essays for the year I at least try to say why it's worth trying.

My wife hoped that for the letter L I would explain "Leibniz, the Inventor of Calculus". I could not in good conscience say 'the', but I could say other things too.

I did reach the letter M! For the A-to-Z this year I wrote about the Mobius Strip:

Also, it features more roller coaster pictures than any other mathematics blog post I've written yet.

For N, my A-to-Z this year reached into another biography-focused piece: John von Neumann.

No roller coaster pictures this time.

I have a special event to announce! I was fortunate enough to host the 141st edition of the Playful Math Education Blog Carnival, featuring many links to mathematics fun, educational, philosophical, or at least accompanied by amusement park pictures:

For the letter Q, in this year's A-to-Z, I wrote about Quadratic Forms and finally, after decades, thought about what it is makes something a 'form'.

For the letter R, this year, I try to explain something about Renormalization. Difficulty level: I do not open with quantum electrodynamics.

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@nebusj There's something particularly friendly and inviting about the art this time.

@jsiehler Thank you! Thomas Dye was rather inspired for this one, and I'm quite happy for it.

@nebusj Nice writeup. For another piece of mathematics credited to Fibonacci, see

@11011110 Thank you! That's a nice visual representation of one of Fibonacci's impressive number-theory projects.

@nebusj Leibniz, the inventor of the binary numeral system?

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