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Dave Richeson

@divbyzero • 25,129 subscribers

Mathematician. Curley Chair in Liberal Arts at Dickinson College. Author of Tales of Impossibility and Euler's Gem. Now: https://t.co/cefdX8CG6u

Shorts

So... my son nerd sniped me! He saw a video on the Fold-and-Cut Theorem by Vsauce and said I should figure out how to fold a piece of paper to cut out the hat and spectre tiles with one cut. Mission accomplished! This blog post has downloadable PDFs:

So... my son nerd sniped me! He saw a video on the Fold-and-Cut Theorem by Vsauce and said I should figure out how to fold a piece of paper to cut out the hat and spectre tiles with one cut. Mission accomplished! This blog post has downloadable PDFs:

14,801 次观看

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Here's some accidental mathematical art in Excel. Each cell is a²b-b mod c where b is the column, c is the row, and a varies from 1 to 30. I put a heat map on the cells (small=red, big=green) and noticed the beautiful patterns.

Here's some accidental mathematical art in Excel. Each cell is a²b-b mod c where b is the column, c is the row, and a varies from 1 to 30. I put a heat map on the cells (small=red, big=green) and noticed the beautiful patterns.

92,448 次观看 • 1 年前

I decided to make a little video using GeoGebra illustrating the relative sizes of the planets, the orbits of the planets, and an assortment of stars (including WOH G64, the largest star of known radius—1540 times the radius of our sun!).

I decided to make a little video using GeoGebra illustrating the relative sizes of the planets, the orbits of the planets, and an assortment of stars (including WOH G64, the largest star of known radius—1540 times the radius of our sun!).

10,054 次观看 • 1 年前

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