"There was a lecture on November 3rd, and the speaker was Honorary Doctor Lax of the School of Mathematics, and interested students should listen to it. Shen Qi posted a message in the WeChat group of the Department of Mathematics, and then continued to blow water with foreigners.

"Miss Helen, why do you Americans always like to provoke war?" Shen Qi spoke in English, chatting with his college English teacher.

Helen Margaret Lawrence, from the United States, is an English teacher at Yan University, and she named herself "Hua Mulan" in Chinese.

"It's a banker's conspiracy, it's a ploy by politicians to deflect domestic contradictions, and most Americans are against the war, and our whole family is anti-war. Helen said.

"Do you feel like the United States is in chaos?" asked Shen Qi.

"So I came to China. Helen didn't get angry, but smiled: "My current boyfriend is Chinese, he is very handsome, very attractive, and more importantly, he is knowledgeable." ”

"Yes, he's also a teacher?" asked Shen Qi.

"No, he's still studying, doing a PhD at Mizuki University. Helen's smile was full of happiness, and she raised her palm and wore a diamond ring on the middle finger of her left hand: "Actually, he has already proposed to me." ”

"Congratulations!" Shen Qi congratulated.

Yan University's sister, Mizuki's man, sure enough, the men of Mizuki University have routines, and even the foreign female teachers of Yan University were abducted by Mizuki men.

"We will have a Chinese wedding in his hometown, after he graduates with a PhD. Wow, his hometown is very beautiful, I've been there a few times, and the stinky tofu is so delicious, I think I'll never be able to live without it, and China. Helen Xian's excitement, "Yes, I love China, and there are Chinese doctors." ”

"Miss Helen, your taste is so special. Perhaps, in the near future, should I call you Mrs. Helen Wang or Mrs. Helen Zhang?"

"After I marry a Chinese man, I don't have to change my surname. ”

Shen Qi and Helen chatted all afternoon.

+1 in English

In the following days, Shen Qi and his university English teacher continued to communicate, looking for the feeling of listening and speaking English, and Shen Qi also learned a lot about the social characteristics and customs of the United States from Helen.

"So you're determined to go to Princeton?" Zhou Yu'an asked Shen Qi.

Today is November 3rd, and this is a large classroom in the Science Building, and Mr. Lacs is about to start a lecture on mathematics.

"If it weren't for math, I really wouldn't want to go to the United States, the United States is too chaotic. Shen Qi said, he looked around, why hadn't Ou Ye come yet?

"You're willing to put yourself in danger for the sake of math. For the sake of the sister, you are indifferent. Zhou Yu'an sighed, "You can't have both beauties and beauties, and you have a lot of life since ancient times." ”

"Where is the beauty?" asked Shen Qi.

"Don't pretend to be confused!" Zhou Yu'an felt distressed for the girls, "I can see through Shen Qi you, there is only one woman you love, and her name is mathematics." ”

At this time, a young man pushed a wheelchair into the classroom, and the audience spontaneously fell silent.

In the wheelchair sat a white old man, Peter Lacs, a leading figure in the field of contemporary applied mathematics.

Lax has long taught at New York University, the mecca of applied mathematics, and he is very friendly to the Chinese mathematical community, and was awarded an honorary doctorate by the School of Mathematics of Yan University.

There are many formulas, theorems, and theories named after Lacs in mathematics today, such as the application of Lacs shock wave condition and entropy in shock wave theory, the Lacks-Winderov format, and the Lacs-Milgram theorem.

The 90-year-old Lax, a Wolf Prize winner, is incapacitated and confined to a wheelchair to give speeches.

Nian Ruiming is not wrong, the old man Lax's English accent is particularly strong, with obvious Eastern European pronunciation. Lax was born in Budapest, Hungary, and later immigrated to the United States.

Lacks' lecture was intermittent, and he paused for three sentences before continuing.

But the students listened with relish, including Shen Qi.

"Nonlinear equations are always annoying...... But on the KdV equation, it is these nonlinear effects that make us ......"

"There is no other field that relies on computation as much as chaos science...... With computation, we can explore the mysteries of chaos, a branch of mathematics that has the power to change the world......"

"Kids, you've heard of the butterfly effect...... The butterfly effect is a theory of chaos ......"

"Butterflies flutter their wings and cause devastating typhoons on the other side of the world......"

"The question is, in the vast Amazon rainforest, there are trillions of butterflies flying, which butterfly is the source of the typhoon......"

"Through mathematics, through calculations, we can find this butterfly ...... accurately"

"And let this butterfly dance its wings at a certain frequency within the specified time......"

"The amount of computation is astronomical, and humans can't do it...... The good thing is that we invented the computer......"

"We must not allow mathematics to become a weapon of war...... But with incredible math, we can solve the drought in the Sahara or the floods in the Amazon at a fraction of the cost......"

……

The temple of basic mathematics is in Princeton, where scholars are responsible for theoretical research.

The arsenal of applied mathematics is at New York University, where engineers are responsible for practical applications.

Shen Qi is more fond of basic mathematics, and he believes that theory determines the level of application, so his goal is Princeton.

"Come to the Science Building!" Shen Qi sent a WeChat message to Ou Ye, he felt that it was necessary for Ou Ye to listen to Lax's lecture, Ou Ye was the calculation Ji, and Lax was the calculation emperor. If Ouye can learn the essence of computing from Lacs, she will one day hope to become the next emperor of the computing world, the empress of computing.

In fact, Shen Qi had already informed Ou Ye that there was a math lecture today, but until Lacks finished his speech, Ou Ye did not appear in the classroom of the science building.

"Ou Ye, what are you doing!" Shen Qi was angry, Lax was ninety years old, and he gave a lecture at Yan University once a year, and listened to it once less.

After listening to Lacs's lecture, Shen Qi rushed towards the building of the Academy of Mathematics, Ouye, you have become a hot stock, and the professors of the Academy of Mathematics are rushing to ask for you, are you floating?

Shen Qi came to the Academy, pushed open the door of the SOS project office, and was about to go crazy, but found Ou Ye lying asleep on the computer desk, with a small medicine bottle next to the computer monitor.

Ouye has a LaTex document on her computer screen, and she is working on the summary section of her SOS thesis.

"Hey......" Shen Qi sighed, distressed, his previous complaints were long gone.

Taking off his coat and gently draping it on Ou Ye's slender shoulders, Shen Qi sat beside Ou Ye and looked at her quietly.