Peach Blossom Luck in the Collapse

Although he didn't have much expression, Kevin just regarded it as not being good at expressing.

Memories end...

Lin Xiu and Kevin returned to the room.

"Lin Xiu, this is Mei, Mei, this is Lin Xiu." Kevin re-introduced Lin Xiu and Mei separately to deepen the impression.

"Hi, I'm Mei." Mei nodded calmly.

"My name is Lin Xiu, just call me Lin Xiu, please take care of me." Lin Xiu nodded and smiled.

"Okay, how about ordering? I'm treating you, you're welcome." Kevin smiled and handed the menu to Mei.

"I'll just do whatever I want." Mei took the menu and handed it back to Kevin... Anyway, she didn't just come to eat.

"Uh...then, Lin Xiu, you can order." Kevin handed the menu to Lin Xiu and said.

"I'm coming..." Lin Xiu took the menu and looked at it, then at Kevin and Mei.

"Okay." Lin Xiu nodded, ordered a few dishes on the menu, and handed the menu back to Kevin.

"Well, just a few more things." Kevin smiled, selected dishes from the menu, called the waiter, and then... the long waiting time...

"By the way, Lin Xiu, where do you live?" Kevin asked Lin Xiu out of boredom. Mei also brought books, at least not too boring, but I am different...

"Mancro Clinic." Lin Xiu said lightly, taking a sip of free boiled water.

"Your family runs a clinic?" Kevin was taken aback, but in this case, Lin Xiu's family is pretty good, right?

"Can't you?" Lin Xiu shrugged.

"No, but the clinic owner of your family actually brought up such a freak like you." Kevin said with emotion, he is good at skills, he should be good at studying, he knows music, and he is handsome... No matter how you say it, you look like the heroine of a novel.

"Are you praising me or hurting me." Lin Xiu sighed.

"Well, can I ask, Lin Xiu..." Mei raised her head suddenly and said.

"Huh? What's the matter?" Lin Xiu looked at Mei and asked in doubt.

"Last time you were in the academy class, the quantum mechanics you talked about conflicted with what you said in the lesson plan, but it was very reasonable. I think you should have a lot to say." Mei said lightly, "Can you listen? Do you have any insight into quantum mechanics?"

"This..." Lin Xiu was stunned for a moment. It turned out that the quantum mechanics he taught was different from what was written in other people's books...

No wonder... After all, they are separated by more than 5 years, of course there will be a difference in one thing.

"Well...how should I put it?" Lin Xiu rubbed his chin, "In quantum mechanics, the state of a physical system is represented by a state function, and any linear superposition of state functions still represents a possible state of the system. The state changes over time. The changes follow a linear differential equation, which predicts the behavior of the system, and the physical quantities are represented by operators that satisfy certain conditions and represent certain operations;”

"The operation of measuring a physical quantity of a physical system in a certain state corresponds to the action of an operator representing the quantity on its state function; the possible values ​​of the measurement are determined by the eigenequation of the operator, and the expected value of the measurement is determined by An integral equation calculation involving the operator."

Mei listened to what Lin Xiu said, and memorized the differences from the lesson plan, and wanted to pick up the notes to write down...

Mei opened her hand and realized that she forgot to bring her pen...

"Sorry, please wait a minute, I'm looking for a pen." Mei raised her head and said apologetically before getting up.

A pen landed in front of her and rolled...

"Make do with it." Lin Xiu said with a faint smile, it seems that this girl is very persistent in learning...

"Thank you." Mei nodded, picked up a pen and simply wrote down the things in her mind on the book.

"Please continue." Mei looked up.

"Okay." Lin Xiu nodded, "Generally speaking, quantum mechanics does not predict a single outcome for an observation with certainty. Instead, it predicts a set of different outcomes that may occur, and tells us how each outcome appears. probability."

"That is, if we make the same measurement on a large number of similar systems, each starting in the same way, we will find that the result of the measurement is a certain number of times for A, a different number of times for B, etc. etc. One can predict the result as an approximation of the number of occurrences of A or B, but not the specific result of an individual measurement."

For Lin Xiu, the time spent waiting for the food to be served has also been consumed, but it is Kevin who is helpless.

Mei is obsessed with studying, Lin Xiu is telling Mei a bunch of theories that make his scalp tingle...

How did your brain record so much gibberish?

Kevin does not claim to be a master of learning, but he is not a scumbag either. However, he is a little helpless in front of Lin Xiu, a cheater, and Mei, a natural talent...

Chapter 14 Girl you like?

"In quantum mechanics, there are two kinds of changes in the state of the system. One is that the state of the system evolves according to the equation of motion, which is a reversible change;"

"The other is to measure the irreversible change that changes the state of the system. Therefore, quantum mechanics cannot give a definite prediction of the physical quantity that determines the state, but can only give the probability of the value of the physical quantity. In this sense, the causal law of classical physics is in the microscopic field failed"

"However, it can also be considered that the causality of quantum mechanics reflects a new type of causality—probabilistic causality. In quantum mechanics, the wave function representing the quantum state is defined in the entire space, and any change in the state is realized in the entire space at the same time. of"

Lin Xiu was still talking eloquently, and Mei was also listening to Lin Xiu's words and deeds carefully, and wrote down something in the book from time to time, as if Lin Xiu was the teacher giving the lecture, and Mei was not the student.

And Kevin is as sleepy as another student...

But fortunately, Lin Xiu didn't continue talking because the dishes had already started to be served.

"Ha..." Kevin sat up from the table and yawned, "Lin Xiu, you guys are too good at talking...don't buy any milk tea, forget about being a teacher...and there are statutory weekends and holidays. "

"I think so too." Lin Xiu sighed, "But I don't have a certificate."

"Exactly." Kevin nodded.

"Okay, come on, let's eat, this restaurant is a time-honored restaurant." Kevin smiled, greeted and began to eat.

"Come on, Mei, try this sashimi, it tastes good with a little wasabi." Kevin smiled and handed a piece of sashimi dipped in wasabi to Mei.