Untitled attachment

Notices where this attachment appears

1. ∑ Xah Lee 李杀 (xahlee@mstdn.io)'s status on Wednesday, 02-Oct-2019 18:03:28 UTC ∑ Xah Lee 李杀

   #math #geometry now i know what hopf fibration is. it's a map of 2d sphere to 3d sphere such that each point on sphere corresponds a great circle on 3d sphere. (2d sphere is a beach ball. we say 2d cuz the surface is 2d. 3d sphere is such that it's 'surface' is 3d, a solid. such ball lives in 4d...)