Dave Richeson

Mathematician. Curley Chair in Liberal Arts at Dickinson College. Author of Tales of Impossibility and Euler's Gem. Now:

[Dave Richeson @divbyzero]

I don't know my plan for Twitter/X. It is hard to give up after all the great people I've met and conversations I had in 13+ years, but the math community has moved to Bluesky. I will use https://t.co/6fqBUld2uQ as my go-to site for posting math content now. Join us there!

[Dave Richeson @divbyzero]

@wtgowers There's this one I know about: https://t.co/vpn4eUgJKK My issue with the pack is that although it does feature mathematicians/math teachers, many of them don't post about math (or the non-math to math content is higher than I prefer). So, I've followed some but not all.

[Dave Richeson @divbyzero]

I don't know my plan for Twitter/X. It is hard to give up after all the great people I've met and conversations I had in 13+ years, but the math community has moved to Bluesky. I will use https://t.co/6fqBUld2uQ as my go-to site for posting math content now. Join us there!

[Dave Richeson @divbyzero]

@JDHamkins Thanks. Maybe I'll be back. Ha!

[Dave Richeson @divbyzero]

@JDHamkins I agree 100%. However, personally, I want to choose one platform as my go-to. I've been putting off the decision, but I think now's the time (for me) to switch. I'm not stomping off in performative anger, but I did want my followers to know.

[Dave Richeson @divbyzero]

@JDHamkins I just did a quick count, and I think I gained about 400 followers in the last week and a half. Again, maybe these are reactionary moves and those new accounts will become dormant. But it feels different to me.

[Dave Richeson @divbyzero]

@JDHamkins Maybe it's a temporary post-election blip. But I think a lot of people have left here, never to return. Maybe I'm wrong though!

[Dave Richeson @divbyzero]

@AllThingsPhysic That's my plan.

[Dave Richeson @divbyzero]

By the way, I just downloaded all my tweets so I'd have them for the future. It is a huge file, but the interface is pretty convenient. I was worried that X might have discontinued that option. Although all the branding is Twitter, everything downloaded without problems.

[Dave Richeson @divbyzero]

@CantabKitty Wow!

[Dave Richeson @divbyzero]

New blog post! I used ChatGPT to help me create a Mandelbrot set in Excel! Here are the 30x30, 60x60, and 250x250 versions. I'm also including a few zoomed-in views. https://t.co/E1KZDZ0NxV

[Dave Richeson @divbyzero]

In case you are moving to Bluebky, you can find me here: https://t.co/NYYL9dHSRO

[Dave Richeson @divbyzero]

@madprofessah All of the images are 250x250 except two in the first tweet (30x30 and 60x60)

[Dave Richeson @divbyzero]

@madprofessah Thanks!

[Dave Richeson @divbyzero]

These are all screenshots of my Excel spreadsheet! You can download the spreadsheet from my blog.

[Dave Richeson @divbyzero]

I guess, now that I've posted this, I realize this isn't *quite* right. If A is 0, then after Z would be BA. If A was 1, then after Z would be A[0].

[Dave Richeson @divbyzero]

Some different bases for numbers and who used them.
Base 10: Egyptians
Base 60: Babylonians
Base 20: Mayans
Base 2: Computers
Base 16: Computers
Base 26: Microsoft Excel

[Dave Richeson @divbyzero]

Here's a fun little "magic trick." Can you figure out how it works? Hint: even and odd numbers. I was thinking you could roll a die to determine how much to count each time. (I saw the trick was credited to Martin Gardner—true? Source?) https://t.co/mXfD765mcW

[Dave Richeson @divbyzero]

typed in my request and pasted a screenshot of the equation from the article. Within five minutes, it was plotted! I then took a true cardioid, scaled and translated it so it was atop the other heart-shaped curve. As you can see, they are nearly indistinguishable!
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[Dave Richeson @divbyzero]

Here's another neat generative AI example.
It is well known, and not hard to show, that the main component of the Mandelbrot set is a cardioid. Looking around the Mandelbrot set, you'll see other cardioid-looking shapes. On the right, you can see the largest one. People who
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[Dave Richeson @divbyzero]

smaller heart-shape is the image of the unit circle under a messy complex map (see below). https://t.co/0k4LanBiYL I wanted to see it with my own eyes, but I didn't want to have to figure out how to graph this beast. So, I asked ChatGPT for the code to graph it in Sage. I
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