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.