I’m approaching the end of this year’s little Mathematics A-to-Z. The project’s been smaller, as I’d hoped, although I’m not sure I managed to make it any less hard on myself. Still, I’m glad to be doing it and glad to have the suggestions of you kind readers for topics. This quartet should wrap up the year, and the project.

So please let me know of any topics you’d like to see me try taking on. The topic should be anything mathematics-related, although I tend to take a broad view of mathematics-related. (I’m also open to biographical sketches.) To suggest something, please, say so in a comment. If you do, please also let me know about any projects you have — blogs, YouTube channels, real-world projects — that I should mention at the top of that essay.

I am happy to revisit a subject I think I have more to write about, so don’t be shy about suggesting those. Past essays for these letters include:

## A.

**Ansatz**(2015)**Axiom**(Leap Day 2016)**Algebra**(End 2016)**Arithmetic**(2017)**Asymptote**(2018)**Abacus**(2019)**Michael Atiyah**(2020)**Addition**(2021)**Analysis**(2021)

## T.

**Tensor**(2015)**Transcendental Number**(Leap Day 2016)**Tree**(End 2016)**Topology**(2017)**Tiling**(2018)**Taylor Series**(2019)**Tiling**(2020)**Torus**(2021)**Triangle**(2021)

## O.

**Orthogonal**(2015)**Orthonormal**(Leap Day 2016)**Osculating Circle**(End 2016)**Open Set**(2017)**Oriented Graph**(2018)**Operator**(2019)**Big-O and Little-O Notation**(2020)

## Z.

**Z-transform**(2015)**Z-score**(Leap Day 2016)**Zermelo-Fraenkel Axioms**(End 2016)**Zeta Function**(2017)**Zugzwang**(2018)**Zeno’s Paradoxes**(2019)**Zero Divisor**(2020)

And, as ever, all my A-to-Z essays should be at this link. Thanks for reading and thanks for sharing your thoughts.

A: Algebraic Geometry

T: Ternary number system (base 3)

O: Ordinary Differential Equations

Z: Zorn’s Lemma

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Ooh, great topics. Thank you!

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