A long time ago, the kingdom of mathematics was chaotic. 0~9 These ten brothers not only dominate the kingdom, but also brag about their best skills. The math angel was very angry when he saw this situation. They sent three little angels, ""and "=", to the mathematics kingdom to establish order and avoid chaos.

Three little angels came to the kingdom of mathematics, and ten brothers from 0 to 9 looked at them contemptuously. Q: "What are you three doing in the kingdom of mathematics? You are not welcome! "

"=" said with a smile: "We are judges sent by angels to help you govern your country well. I am an equal sign, and these two are' greater than sign' and' less than sign'. Who they speak to is greater; Whoever they point to is the youngest. "

I heard that they were judges sent by angels, and the ten brothers obeyed the orders of ""and "=". Since then, the mathematical kingdom has had a strict order, and no one dares to violate it.