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)
nebusresearch 
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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