What jokes do mathematicians have?

The engineers, physicists and mathematicians of 1 received a task at the same time: to nail a nail into the wall. The engineer built a universal nailing machine, that is, a machine that can nail any possible nail into any possible wall. Physicists have done a series of tests on the strength of hammers, nails and walls, and then developed a revolutionary technology-ultra-low-temperature ultrasonic nailing technology. Mathematicians extend the problem to N-dimensional space, and consider the problem that a kinked 1 dimensional nail penetrates the N- 1 dimensional super wall. Many basic theorems have been proved ... Of course, the depth of this topic makes the existence of simple solutions far from obvious. A farmer invited engineers, physicists and mathematicians to enclose the largest area with the least fences. The engineer fenced a circle and declared that it was the best design. The physicist stretched the fence into a long straight line and thought it was big enough to enclose half the earth. The mathematician gave them a big laugh. He surrounded himself with several fences and then said, "I'm outside now." Physicists and engineers got lost in a hot air balloon in the Grand Canyon. They shouted for help: "Hello! Where are we? " After about 15 minutes, they heard the response echoing in the valley: "Hey! You are in a hot air balloon! " The physicist said, "That guy must be a mathematician." The engineer wants to know, "Why?" The physicist said, "Because it took him a long time to give a completely correct answer, but it was useless." I forgot all about algebra. Who will explain this? ) constant function and exponential function e walk in the street with the power of x, and I see the differential operator far away. The constant function was so scared that it quickly hid and said, "If I differentiate by it, there will be nothing!" " Exponential function said unhurriedly, "It can't do anything to me, I am the x power of E!" " "Exponential function meets differential operator. Exponential function introduces itself: "Hello, I am the X power of E" Differential operator says: "Hello, I am d/dy! "Physicists, astronomers and mathematicians happened to see a black sheep when they were walking on the Scottish Plateau." "Ah," said the astronomer, "so Scottish sheep are black." "Come on, you can't just say that based on one observation." The physicist said, "You can only say that this black sheep was found in Scotland." "No," said the mathematician, "from this observation, you can only say: At this moment, this sheep, from our observation point of view, its surface is black! "One day, the mathematician felt that he had had enough of mathematics and ran to the fire brigade to announce that he wanted to be a fireman. The fire chief said, "you look good, but I have to give you a test first." "The fire chief took the mathematician to the backyard alley of the fire brigade. There is a warehouse, a fire hydrant and a hose in the alley. The fire chief asked, "Suppose the warehouse was on fire, what would you do?"? "Mathematicians?

"I connected the fire hydrant with the water pipe, turned on the water pipe and put out the fire." The fire chief said, "Exactly! Last question: suppose you walk into an alley and the warehouse is not on fire, what would you do? " The mathematician pondered for a long time in doubt and finally replied, "I will set fire to the warehouse." The fire chief shouted, "What? That's terrible! Why did you set fire to the warehouse? " mathematician

"In this way, I will simplify the problem into a problem that I have solved."