NathanielMath's profile picture. Associate Professor of Mathematics at Mount Allison University
I have moved over to BlueSky: @njohnston.ca

Nathaniel Johnston

@NathanielMath

Associate Professor of Mathematics at Mount Allison University I have moved over to BlueSky: @njohnston.ca

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I know that my 17 non-bot followers will be devastated, but this site is officially so gross that I can't use it anymore. I've gone to BlueSky: @nathanielmath.bsky.social


Has anyone tried outsourcing their entire research program to MathOverflow? Seems a lot easier than actually doing research. Anyway: mathoverflow.net/questions/4795…


Our paper about the new determinant formula is published! cambridge.org/core/journals/… Really fun to write a paper with @robinhouston and @apgox, and really neat to write a paper that stemmed from Twitter, of all places ().

The trick is that you can traverse the hexagon in either direction, so it's okay that we're missing a piece. We didn't define I = i(d-e) which would be the natural sixth thing. We didn't need to because each of the six is the negation of the sum of the other five.



Over 15 years ago, I wrote a blog post with some formulas involving maximal self-avoiding walks (njohnston.ca/2009/05/on-max…). At the end of last month, @jpantone et al posted a paper that improves upon those results in ridiculously impressive ways (arxiv.org/abs/2407.18205).


Fun fact for quantum information folks: if rho and sigma are separable density matrices (mixed quantum states) then their Hadamard product is separable as well. I somehow didn't notice this until today. Is this used anywhere?


Minimal superpermutations are too hard. Solution: generalize and a problem that is easier!... in all cases except for the case we actually care about. New video: youtu.be/Uds_fgle37c

NathanielMath's tweet card. Superpermutations but Easier - Minimal Injective Superstrings

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Superpermutations but Easier - Minimal Injective Superstrings


A 1993 math paper that I'm reading mysteriously has lots of "w"s missing. Anyone have any insight onto why this might have happened? Is there some software that was commonly used back then that could've led to this problem, or is it likely just a find-and-replace mistake?

NathanielMath's tweet image. A 1993 math paper that I'm reading mysteriously has lots of "w"s missing. Anyone have any insight onto why this might have happened? Is there some software that was commonly used back then that could've led to this problem, or is it likely just a find-and-replace mistake?

Why does every single graph on Twitter say something like “Source: A questionnaire by The Washington Post” on it with no URL or further information? Half a step away from writing “Source: Internet” but people do it completely unironically.


It’s never too early to teach the kids about quantum computing.

NathanielMath's tweet image. It’s never too early to teach the kids about quantum computing.

Dave Greene is doing an Ask-Me-Anything about Conway's Game of Life and our book: news.ycombinator.com/item?id=401315…


Nathaniel Johnston 已转帖

Has anyone studied the optimal packing of quarter-discs into a square? @StockansOatcake

robinhouston's tweet image. Has anyone studied the optimal packing of quarter-discs into a square? @StockansOatcake

Starting a series of video tutorials for pattern construction in Conway's Game of Life. Video #1 is now up, which discusses how to put together Herschel tracks, and thus oscillators/glider guns of any period >= 61: youtube.com/watch?v=eZ9BBc…

NathanielMath's tweet card. Herschel tracks tutorial for Conway's Game of Life - Part 1 - Making...

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Herschel tracks tutorial for Conway's Game of Life - Part 1 - Making...


Making a Manim package to produce pretty Game of Life videos.


Andreas Winter solving the real problems of quantum information theory this April 1. arxiv.org/abs/2403.19977


Solving the "Lights Out" Puzzle via Linear Algebra (Holy cow I hope these start to take less time to make as I get more comfortable with Manim...) youtu.be/1izbpSk3ays

NathanielMath's tweet card. Solving the "Lights Out" Puzzle via Linear Algebra

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Solving the "Lights Out" Puzzle via Linear Algebra


First true period 15 and 16 glider guns found in Conway's Game of Life. Now that omniperiodicity of oscillators is solved, how long until omniperiodicity of true period glider guns? youtu.be/dfmCyrfxkTM

NathanielMath's tweet card. First true period 15 and 16 glider guns found in Conway's Game of Life

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First true period 15 and 16 glider guns found in Conway's Game of Life


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