so I was reading through the blogs and find an interesting problem sushi disk problem. It was written in Chinese, so I am going to translate it.
Correct me where I mistake something if you know Chinese
The author was having sushi with his friend in the Restaurant where sushi is served on rotating tables. After his friend had enough sushi, he began to get annoyed by the disks because they are not distributed evenly, so he pick the middle disk of the 3 disks next to each other and adjust its position to make it the center of other two, and he did it again and again. and suddenly he had this assertion: Assume no one else is touching the sushi table. if he keep on doing that, eventually all the disks will become evenly distributed.
It was a quite interesting problem to me, and he eventually proved this assertion by using some linear algebras
householder transformation etc.... Well, that's too much kill in my opinion. so is there any simple proof on this ?