@narain@mathstodon.xyz

Rahul Narain @narain@mathstodon.xyz

· 5mo ago

Wearing a T-shirt to a party that says "I'd rather be thinking about linear algebra"

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Rahul Narain @narain@mathstodon.xyz

· 10mo ago

This is amazing:

https://ianthehenry.com/posts/bauble/building-bauble/ by @ianthehenry@mastodon.social

ianthehenry.com

Building Bauble

I made something that I think is pretty neat, and I want to tell you about it. This is a little hot air balloon made out of alternating layers of brass and bronze that stack together with these angled facets: It’s 3D printed, sort of, but it really is solid metal – it’s not a metallic filament. It’s made by “lost wax casting,” where you 3D print a model out of resin, then pack it in plaster, and then once the plaster dries you melt out the resin and fill the void with molten– You know what?

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Rahul Narain @narain@mathstodon.xyz

· 5mo ago

Replying to

@henryseg You also get a snub cube* halfway through the transformation! (*not quite equilateral though)

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Rahul Narain @narain@mathstodon.xyz

· 9mo ago

@skewray@mathstodon.xyz @thalesdisciple@mathstodon.xyz Yes, you should get an error bound of the form C (b − a)⁵ max {|f''''(x)| : x ∈ [a, b]}, where C is the integral of the aforementioned quartic p on [0, 1] with fourth derivative p''''(x) = 1.

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