Recent content by BrianKim

I meant this. I heard that this octahedron don't exist. But...

I heard somewhere that the Octahedron can't exist in the Cube exactly. Is this true? Can't I prove that the octahedron in the cube? Intuitively, they seems true. But I can't sure.

Hi. I'm high school student who is doing a math project. Yesterday, my project partner (to be precise, his teacher) told me that one can prove the photoelectric effect with conic section, especially with hyperbola. (But, actually, I can't even understand the meaning of the statement. For me...