Rational curvature of a polytope | Algebraic Topology | NJ Wildberger

[@misterterse94]

Gotta say, im growing quite fond of calling these rotational displacement units "tangles". Thank you for these videos, they're wonderful.

[@johnstroughair2816]

Really enjoying these lectures. Thanks for making them available.

[@KipIngram]

6:40 - Don't those lambdas also have to be in the range 0 to 1 and all sum to 1?

[@rjlasota]

Thanks for making these videos! You give the impression that Descarte wrote to Leibnitz, but Descarte lived 31 March 1596 - 11 February 1650, and Leibnitz lived July 1, 1646 - November 14, 1716. I guess you meant Leibnitz got a hold of this letter from Descarte.

[@sam111880]

I am wondering where you get those snap together polyhedrons an stick / ball chemistry based polyhedron as that's a fantastic way to teach algebraic topology visually . As it's hard to visualize the object / concepts sometimes . But with those object it makes it much more easy to see in my opinion

[@njwildberger]

They are called Polydron and are commercially available. Along with Zome, my favourite construction toys.

[@sam111880]

@@njwildberger Cool have yet to see them but it seems they be a really good tool along with computers to demonstrate these objects. Because sometimes you need to see 3d in 3d. Anyway curious on what other solids you can make from Polydron / Zome.

[@sam111880]

Is it just for the platonic and archimedean solids. Or can you do johnson solids or perhaps a general polyhedron something weird like convex or concave polyhedrons.. Just trying to figure out how general your configurations be with these tools.

[@njwildberger]

Quite correct, Leibnitz would have gotten a copy, or made a copy, of this letter.