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Roy Goodman

@manroygood.bsky.social

Mathematician, Professor, Director of Graduate Studies NJIT Math, Founding President SIAM New York-New-Jersey-Pennsylvania section, nonlinear dynamics of waves & vortices, LaTeX nit-picker, sometime spoon carver, lesser of two weevils

27 Followers  |  88 Following  |  19 Posts  |  Joined: 12.03.2024  |  2.1402

Latest posts by manroygood.bsky.social on Bluesky

It's been in my bookmarks folder since the Netscape era. I just deleted it. Thanks for the reminder.

15.09.2025 23:57 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

๐Ÿ“Œ

12.08.2025 23:20 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0
A whiteboard with the words "Lax Wendroff" and the iteration formula for the Lax Wendroff method applied to a nonlinear advection equation.

A whiteboard with the words "Lax Wendroff" and the iteration formula for the Lax Wendroff method applied to a nonlinear advection equation.

I taught numerical PDE this semester. This was on the whiteboard on his 99th birthday:

17.05.2025 01:15 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

#mathsky ๐Ÿงฎ

17.05.2025 01:12 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0
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Peter Lax, Pre-eminent Cold War Mathematician, Dies at 99

www.nytimes.com/2025/05/16/s...

17.05.2025 01:11 โ€” ๐Ÿ‘ 3    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0
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Diffusion Limited Aggregation in Ants Biting off Wall Paint Diffusion limited aggregation (DLA) is a well studied phenomenon in which diffusing particles cumulatively aggregate on a starting fixed seed point, forming a pattern which is fractal in structure. He...

It's even better. It's DLA:

arxiv.org/abs/2504.13400

10.05.2025 22:46 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0
Roy Goodman Roy Goodman is a professor and Associate Chair for Graduate Studies in the Department of Mathematical Sciences at NJIT

Math/typesetting/BlueSky geek post: I finally figured out how to get the BlueSky icon in my HugoBlox-based homepage, and removed the link to my deleted account on that other site. roygoodman.net

26.04.2025 02:02 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

#MathSky

27.03.2025 14:19 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

Tagging for ๐Ÿงฎ. Every year I read the citations and the popular press writeup and learn a bit about math outside my area. In this one, the citation admits, "Yes, this is very technical," and I still don't feel I know what he's done. Can anyone communicate this better? Maybe @stevenstrogatz.com

27.03.2025 14:10 โ€” ๐Ÿ‘ 4    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

That sounds great. Please share a link.

24.03.2025 19:06 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0
Post image Post image

I carved these wooden Mรถbius strips and keep them in my office to fidget with and show to visitors.

19.03.2025 12:15 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0
The Pi-Search Page Search for any string of digits in the first 200 million digits of Pi

So, this must be pi. I googled "search for a string of digits of pi" and found the page below which informs me that 04437805 appears in pi at position 7642 after the decimal point and agrees with your window shade beyond that. www.angio.net/pi/

13.12.2024 03:17 โ€” ๐Ÿ‘ 17    ๐Ÿ” 1    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0
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The Number Devil - Wikipedia

I have read the "The Number Devil" by Hans Magnus Enzensberger with both my kids, and they've read it countless times by themselves afterward. I've looked and looked for another book like this, but have found nothing else comes close.

en.wikipedia.org/wiki/The_Num...

02.12.2024 14:48 โ€” ๐Ÿ‘ 2    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

I have always wanted to propose a SIAM mini symposium on the theme of Applied Mathematicians who go by their middle name. I could easily fill three sessions.

15.11.2024 22:58 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

What about @guprofbc.bsky.social ?

19.09.2024 00:51 โ€” ๐Ÿ‘ 2    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

No transit expertise, just a frustrated user. The Northeast Corridor trains have been clustered this way 7 days a week as long as I've been riding both weekdays and weekends, but weekends are worse.

15.09.2024 23:28 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

20+

15.09.2024 22:43 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

It has been like this since they opened the stop at EWR 2+ years ago.

15.09.2024 22:43 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

@guprofbc.bsky.social

08.06.2024 15:33 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

@manroygood is following 20 prominent accounts