Ciro Santilli @cirosantilli 40

Combination of other sub-Lagrangians for each of the forces, e.g.:

Describes perfect lossless waves on the surface of a string, or on a water surface.

Uniqueness: math.stackexchange.com/questions/1113622/uniqueness-of-solutions-to-the-wave-equation

As mentioned at: math.stackexchange.com/questions/579453/real-world-application-of-fourier-series/3729366#3729366 from solving partial differential equations with the Fourier series citing courses.maths.ox.ac.uk/node/view_material/1720, analogously to the heat equation, the wave linear equation can be be solved nicely with separation of variables.

All possible repetitive crystal structures!

219 of them.

Specials sub case of the general linear group when the determinant equals exactly 1.

A young Ciro Santilli really liked this game, the way it makes you feel.

Commit: github.com/cirosantilli/cirosantilli.github.io/commit/794705a201a79b5128934e69df85e3511655c03f

As Ciro started getting a lot of comments on his home page about China, he decided that Disqus does not scale, and that it would be more productive long term to remove it and point people to GitHub issues instead.

Upsides of removal:

Downsides:

Ciro's stance towards China hasn't changed, and China comments and corrections about his website are still welcome as always.

Related issue: github.com/cirosantilli/cirosantilli.github.io/issues/37