Gelfand pair

Okay kiddo, have you ever played a game of catch with a friend? When you play catch, you throw a ball to your friend and they throw it back to you. This is called a pair in math.

A Gelfand pair is like a special type of game of catch where you have two teams of players. Each team member throws the ball to someone on the other team. But, the tricky part is that each team member can only throw the ball to certain people on the other team.

This is just like how certain numbers can only be multiplied or added to other certain numbers in math. The Gelfand pair tells us which teammates can throw the ball to which other teammates. It helps us understand how things are connected in math.

It may seem complicated, but just think of it like a game of catch with special rules and players!