Life may be difficult to surprise Lin Fan, but he has been frightened, from the beginning he was hit by this woman, and then the blind date was her... This in itself was an unusual experience, and as a result... I never thought that this woman would actually live opposite her door.

Okay,

Maybe that's how the world comes.

But who can know, she didn't even let go of work, the two actually worked in the same university and the same branch, but the gap in identity was a little bigger.

As soon as I remembered this morning, the refrigerator woman said to herself... I'll make you regret it!

Lin Fan's head began to hurt, at first he thought it was just a threat, but in fact... The other party can really find trouble with himself, just ask... One is a professor, and the other is just a temporary worker in the library, and if he reveals it to the branch leader a little, he will basically leave.

In fact, Lin Fan loves this job, mainly leisurely... In addition, if you take care of a lunch, if you walk around by yourself, you can become a regular employee in a few years, not only with housing subsidies, food subsidies, transportation subsidies, high temperature subsidies... And you can also pay the housing provident fund.

The future is simply not too nice, but all this has been just a bubble for a long time, and it will burst when you poke it.

In the morning,

Lin Fan was in a state of fear and confusion, the ghost knows how he survived, in short, there were still ten minutes to eat, and silently took out a homemade sign and put it on his table, which read... It's resting, it's that simple and straightforward.

Lin Fan has an advantage, he never makes excuses for being lazy, he is so upright, he is lazy and lazy.

With his employee ID card, Lin Fan came to the nearby canteen, there are a total of eight canteens in this university, and the food in the eight canteens is different, but... The core is all the same.

At this moment, Lin Fan was queuing up with a plate, and looked up at the slogan at the mouth of the dish, such as who knew that the Chinese food on the plate was hard work, or what kind of waste was shameful, and there was an unspeakable anger in his heart.

Irony!

What a thief's irony!

If we all know that waste is shameful, why can't we make it delicious?!

For the school cafeteria, Lin Fan is angry, in fact, the food is not delicious at all, but can the canteen invite some healthy people to come to work? Every chef who cooks has Parkinson's, and as long as he cooks, he will shake vigorously... It's okay to shake, care about some vulnerable groups, but these guys specialize in shaking out the meat.

soon

It was Lin Fan's turn to cook, he looked around at the dishes in front of him, and casually ordered two vegetarian and one meat, anyway, he didn't have any hope for the canteen where he studied, he just wanted to be full!

When Lin Fan finished cooking, there were not many seats in the cafeteria, and then he found a corner position, and a person sat there quietly to eat, but halfway through eating, a little fat man suddenly came, holding a plate of four meat and one vegetarian, sitting opposite Lin Fan.

"Brother Lin!"

"Eat so healthy today?" said the little fat man in front of him, "Or... Divide your platoon?"

The man who spoke was called Liang Xuchao, a junior in the physics department, and his acquaintance was an accident, when Lin Fan was playing a female orc warrior, and deceived Liang Xuchao with a lot of gold coins by relying on a voice changer, and then the two found out that it was a school in a chat in the game.

However, Liang Xuchao is very open-minded, and he will not be angry because Lin Fan is a 'women's clothing boss', but the relationship between the two has always been good, not only in a guild, but also in a team.

"Don't. ”

"Recently lost weight. "Lin Fan likes to eat meat, but the meat in the school cafeteria is not delicious.

"Brother Lin!"

"Today there is a new female professor who teaches the fundamentals of physics in quantum mechanics and also leads the research team of the college. Liang Xuchao said seriously: "Only twenty-eight years old... It's awesome, but this man... It's a bit impersonal. ”

Don't!

What emotions does the refrigerator have!

Only refrigeration!

Lin Fan glanced at the little fat man and asked curiously, "Why is it unkind?"

"Bad luck. ”

"The morning was her basic physics class in quantum mechanics, and I thought that the new professor would take classes on his first day, that is, just take it casually, but it turned out to... After looking at the progress from half an hour ago, he judged us and the professor from before. ”

Speaking of which,

Liang Xuchao sighed: "Then we were given two days to solve a problem... If it can't be solved, everyone's usual score will fail. ”

it!

This woman is so ruthless!

However, thinking of Liu Yun'er's appearance, Lin Fan was also relieved... This fits well with her overall image.

"It's cold!"

"It's so cold. Liang Xuchao sighed and said, "Brother Lin... What to do?"

"How do I know!"

"I'm just a temporary library worker. Lin Fan didn't want to have anything to do with Liu Yun'er at all, so he ate lunch by himself, and after a while... He said, "Find another professor." ”

"It's useless!"

"The solution we can think of, will she not think of?" Liang Xuchao said: "I guess we have already said hello." ”

Alas sighed for a while,

Liang Xuchao shook his head, leaving all his worries behind, and frantically picking up the food, his eating speed was very fast, compared to Lin Fan, who was chewing slowly, it was simply the speed of light.

"Brother Lin!"

"The boys in the class and I are going to go to the seniors in the department who play with Warcraft nostalgia clothes, if anyone can help us solve this problem, we will hack a piece of equipment to him. Liang Xuchao said: "You know... Your dreams, legendary weapons... Wind Sword!"

Hearing this,

Lin Fan was directly stunned, and then said angrily: "I said that you can talk about the key points in the future?!"

"Huh?"

"What do you mean?" asked Liang Xuchao with a blank expression.

"Show me the title!" Lin Fan said angrily: "Hurry up... Only I deserve this weapon!"

"This..."

"Ringo... If you're a college graduate, don't join in the fun. Liang Xuchao smiled bitterly: "It's not that I deliberately belittle you, this is a problem of quantum mechanics!"

"Can't I find someone?" Lin Fan glanced at him.

Liang Xuchao asked curiously, "Who are you looking for?"

“...”

"Who do you care I look for... Anyway, I can solve it, can you hurry up?" Lin Fan said seriously: "I'll tell you... After this village, there is no such shop, and now the opportunity is coming at you like raindrops, are you going to avoid it all?"

Liang Xuchao pondered for a while, and decided to give Lin Fan a try, anyway, if he gave it to him, he could also give it to others, and one more person would have one more chance to solve it.

afterwards

Lin Fan received Liang Xuchao's WeChat message, which contained a picture of the question that Liu Yun'er gave them.

In fact

This is a calculation of the momentum and expected value of the momentum of the free particle, when t=0, the state of the free particle is A=(sin^kx+coskx), and then the average momentum and average kinetic energy of the particle are found.

Is it difficult?

It's really hard!

Because you can't directly apply the expected value formula of momentum to calculate it, the reason is simple... The applicable condition must be that the state wave function of the system is normalized, and this problem obviously does not meet the requirements.

"I don't understand, right?" Liang Xuchao said helplessly: "Brother Lin, don't slap your swollen face and become fat, you can't find anyone who can solve this problem at all, this problem is very professional... Calculations on free particles. ”

Lin Fan ignored him, got up and left the cafeteria, leaving Liang Xuchao sitting there with the word 'confused' written on his face.

"Ugh..."

"Brother Lin is good at everything, he just likes not to slap a swollen face and become fat. Liang Xuchao sighed, remembering Lin Fan in the game, playing the most critical position in the team... The tank profession still advertises himself as a professional player every day, but he can't hold the blame, a team destroys the machine.

No strength,

But he loves to pretend to be forced,

Not only delicious and lazy to do,

I also like to be greedy for cheap.

This is Liang Xuchao's comprehensive impression of Lin Fan.

......