I don’t know how Wolfram Alpha knows; I’m fearfully ignorant of this sort of thing myself. Perhaps there’s a well-known decomposition of the 600-cell into nice simple bits whose 4-volume is easy to calculate?
The method I use below (integrate its surface area) works for every regular polytope, so it could be the method Wolfram Alpha uses. The only difficult part is simplification of a complicated trigonometric expression, but Wolfram Alpha eats those for breakfast.
On the other hand there are only three families of regular polytope above dimension 4, so maybe it just knows a general formula for those three families and then just has the five exceptional regular polytopes programmed in as special cases.
Vs lbh glcr “ibyhzr bs 600-pryy” vagb Jbysenz Nycun, gur nafjre V nffhzr lbh’er ybbxvat sbe pbzrf fgenvtug bhg.
This was quick, if true.
How does Wolfram Alpha knows that? And since when?
http://hi.gher.space/wiki/Hydrochoron
Those guys should update, and also should Wikipedia.
I don’t know how Wolfram Alpha knows; I’m fearfully ignorant of this sort of thing myself. Perhaps there’s a well-known decomposition of the 600-cell into nice simple bits whose 4-volume is easy to calculate?
The method I use below (integrate its surface area) works for every regular polytope, so it could be the method Wolfram Alpha uses. The only difficult part is simplification of a complicated trigonometric expression, but Wolfram Alpha eats those for breakfast.
On the other hand there are only three families of regular polytope above dimension 4, so maybe it just knows a general formula for those three families and then just has the five exceptional regular polytopes programmed in as special cases.
The second of those seems extremely likely. (But, I repeat, I don’t really know anything about this stuff.)