I decided to let the V essay slide to Wednesday. This will make the end of the 2020 A-to-Z run a week later than I originally imagined, but that’s all right. It’ll all end in 2020 unless there’s another unexpected delay.

I have gotten several good suggestions for the letters W and X, but I’m still open to more, preferably for X. And I would like any thoughts anyone would like to share for the last letters of the alphabet. If you have an idea for a mathematical term starting with either letter, please let me know in comments. Also please let me know about any blogs or other projects you have, so that I can give them my modest boost with the essay. I’m open to revisiting topics I’ve already discussed, if I can think of something new to say or if I’ve forgotten I wrote them about them already.

Topics I’ve already covered, starting with the letter ‘Y’, are:

**Y-Axis**(2015)**Yukawa Potential**(Leap Day 2016)**Yang Hui’s Triangle**(End 2016)**Young Tableau**(2017)**Yamada Polynomial**(2018)**The Game of ‘Y’**(2019)

Topics I’ve already covered, starting with the letter ‘Z’, are:

**Z-Transform**(2015)**Z-Score**(Leap Day 2016)**Zermelo-Fraenkel Axioms**(End 2016)**Zeta Function**(2017)**Zugzwang**(2018)**Zeno’s Paradoxes**(2019)

I like the idea of “zero divisor” for ‘Z’. I’m not sure if it would lead to a good article or not, but I remember feeling intense curiousity, once upon a time, about the idea of things that aren’t zero multiplying together to make zero.

Zorn’s Lemma could be a fruitful topic, too, I suppose.

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Great topics, yeah. Thank you!

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