I really don't want to lie down and win

"The essence of quantum mechanics lies in superposition and collapse." Xu Mang said: "In the microscopic world, a quantum state can be in a superposition state. This concept was put forward by Bohr, which almost killed Einstein." A great scientist who died, many people opposed him at the time, among them was Schrödinger, one of the founders of quantum mechanics."

"and many more!"

"You fooled me, didn't you?" Yang Xiaoman gave a blank look: "Shouldn't it be Schrödinger who proposed it? Isn't that what Schrödinger's cat is the explanation of quantum superposition state?"

"No no no!"

"Schrödinger's cat is just a thought experiment. It is used to refute Bohr's point of view." Xu Mang said, "Are you going to learn or not? Don't learn how to play games from me!"

Yang Xiaoman pouted and nodded helplessly.

"Do you know about the decay of atoms?" Xu Mang asked: "I'll take uranium atoms as an example. Uranium atoms are an unstable atom. It may turn into lead atoms without warning. The change of atoms can only change from heavy to light." , which means that each time the weight decays, we call this process decay."

"Atomic decay is a random phenomenon. For a single atom, it is impossible to predict when it will decay. That is to say, there is uncertainty about whether an atom will decay." Xu Mang continued: "So Bohr proposed Before observing atomic decay, the atom is in a superposition of decay and non-decay."

"Schrödinger was very upset when he heard that. Bohr told Schrödinger that you can hit me if you have the ability, and then Schrödinger proposed a half-dead cat to refute the idea of ​​quantum superposition." Xu Mang said.

Yang Xiaoman's face was full of black lines, why did Bohr look so similar to Xu Mang?

"Then can you explain Schrödinger's cat, the core of this idea?" Yang Xiaoman asked.

"sure!"

"First of all, Bohr's quantum superposition state is admitted, but a ridiculous conclusion is derived, which shows that Bohr's conclusion is ridiculous." After a pause, Xu Mang said: "It's similar to what you do now, you take care of yourself." It's over after listening, why are there so many questions?"

Yang Xiaoman gritted her teeth angrily, it's really a turn of events, that's what she said about him in the past.

In the ensuing discussion on collapse,

Yang Xiaoman quarreled with Xu Mang again, and they quarreled under the covers.

...

this day,

Xu Mang took the data disk and found Director Fang.

"Director Fang."

"This is my paper." Xu Mang said with a smile, "Absolutely!"

Director Fang glanced at Xu Mang's expression, and there was a bit of a slut in his smile, and he couldn't help but feel something was wrong.

"Xu Mang?"

"what?"

"How difficult is the paper for the advanced mathematics section?"

"It's not difficult."

Director Fang didn't really believe Xu Mang's words, so he inserted the data disk to look at the contents, and clicked on a set of high-level math papers from his freshman year. He almost died of anger.

"Is this a high number?" Director Fang asked.

"Yes!"

"I put basic physics in it. It seems that they are all physics problems, but they need to be solved with advanced mathematics." Xu Mang said with a smile: "When doing advanced mathematics problems, I consolidated my knowledge of physics by the way. Isn't it killing two birds with one stone?"

"That is to say, if the basic physics is not good, I'm sorry... I will die in battle." Xu Mang said: "The students should be impressed when they see it, and shout that this volume is exquisite!"

"Xu Mang?" Director Fang smiled wryly, "Do the students have any grudge against you?"

"No."

"I've been thinking about these sets of papers all night." Xu Mang said, "I don't think it's very difficult."

Isn't it hard?

Director Fang is the top in this field. After reading a question casually, the complexity of it gave him a headache.

This is so difficult that it cannot be described in words.

He dared to conclude that throwing away the basic physics, only the advanced mathematics part,

Even if students from the Department of Mathematics do it, it is estimated that they will die one by one.

"correct."

"How do you plan to score?" Director Fang asked, "How much is the usual score?"

"zero!"

"I don't know how they usually are." Xu Mang shrugged, "The score will be as high as the test, if you don't accept it, come to me, I'll beat him to death!"

Director Fang smiled helplessly, finding you is harder than finding me, it's no wonder the students can find you.

"three days left."

"You also go back and prepare for the exam." Director Fang said: "This is the last exam in your life, cherish it well, if you think about the exam in the future, you will be gone, so do a good job in the exam and draw a perfect ending .”

"Oh..."

Just as Xu Mang was about to leave, Director Fang stopped him and said seriously, "By the way, you've been living in someone else's dormitory, right?"

"what?"

"This...uh...it's not what you imagined." Xu Mang was a little embarrassed.

"Don't get me wrong." Director Fang said: "Remember to turn off the phone recently, and during the high math exam, you will be in charge of proctoring the exam."

...

Physics Department Building,

The classroom of the sophomore majoring in condensed matter physics.

Although there are no classes anymore, many students came to the classroom early to start self-study as usual.

"Ugh?"

"Have you heard?" A certain student said, "Our advanced mathematics papers may be written by Professor Xu Mang, and the entire physics department is written by Professor Xu."

"what?"

"Are you sure?" Another student asked in horror: "Are there any characteristics of his papers? If we know the characteristics of the questions, we can review them in a targeted manner."

The student shook his head: "There is too little information about Professor Xu. I heard that he hardly attends classes."