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And the last of my A-to-Z topics for the year: the zero divisor! Which I had thought was just one of those things you know you should remember better, in Intro to Algebra, and then turns out to be more fun than that.

nebusresearch.wordpress.com/20

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I tried one last biographical piece for this year's A-to-Z sequence: Yang Hui. Along the way I discovered there's not much biographical stuff known, at least in the kinds of reference I can find, about him.

nebusresearch.wordpress.com/20

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crowdfunding, personal 

As you may know, I've been struggling to get by for some time. If possible, I'd like to secure enough to take care of the next four months, covering HRT & clinic costs, contact lens replacement, and food. If there's more in the fund, I could also take care of replacing either the phone's battery or the phone, and maybe even do something about the laptop, with a battery now about twice the height of the case, a keyboard requiring a lot of very firm, deliberate pressing, and WiFi that drops out for a day or two.

uk.gofundme.com/f/help-cover-f

#TransCrowdFund

:boost_rainbow:

One week closer to the end of the alphabet. For 'X', I used some creative license and wrote about extraneous solutions. Along the way, I started to understand them, at least a bit. Still not quite satisfied that I do, though.

nebusresearch.wordpress.com/20

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The interval between when you create a new macro and when you start regularly using it to handle that annoying repetitive task.

(The oral syringe is for a cough syrup the rabbit takes as possible treatment for allergies. It turns out rabbit allergies are an under-explored part of veterinary medicine. In the second picture she's chinning the empty syringe because she really likes it and wants everyone to know that it's hers.)

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Nearing the end of the 2020 A-to-Z! For the letter W, the Wronskian.

nebusresearch.wordpress.com/20

Also there's much I did not know about Józef Hoëne-Wroński and still don't.

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The Replay Foundation, my employer, announced their liquidation today. This means no more Pinburgh. It also means I'm Officially out of a job for the forseeable, so if y'all wouldn't mind boosting a link to my other source of income Improbable Island, that'd be just super.

improbableisland.com

It's a silly online game and it doesn't pay as much as fixing pinball machines but heck it's what I've got right now, and this winter's probably gonna be a hairy one.

Thinking of that time my wife and I were in France and the clerk at the 24/7 convenience store (closed Tuesdays) asked how English speakers pronounced the name of the Lion candy bar, and we told him, and he repeated it and was so delighted by the sound of "lie-ohn".

That period after accidentally closing a file when you can't find any hint about what file it was and haven't yet accepted that if it's taking this long to figure out what it was you probably didn't need it open.

I apologize for slipping behind on this again. November's been a heck of a month.

For the 2020 A-to-Z the letter 'U' brought me to Unitary Matrixes:

nebusresearch.wordpress.com/20

It's a little rough because the first half of last week was not a good one for my focus.

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When I got to the letter T for my 2020 Mathematics A-to-Z glossary, I picked Tiling, always a fun subject:

nebusresearch.wordpress.com/20

After it posted I discovered I had already written about it for my 2018 A-to-Z, so rf. It's cute, though, comparing what parts I figured were more important and what I could gloss over in the unintentional rewrite:

nebusresearch.wordpress.com/20

Join me in 2022 when I do tiling *again* for no good reason.

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

nebusresearch.wordpress.com/20

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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'.

nebusresearch.wordpress.com/20

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USpol, Covid-19, England History 

The complete lack of mention of Pence taking over as Acting President makes me think of how King Charles II supposedly told James Duke of York there that he didn't need a bodyguard in London, as "no one would kill me to make you King."

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