Hero's Twilight!

"Dewitt teacher, I received the prize. I'm studying it, and I see the content is related to cryptography? Is this notebook for researching cryptography?"

Song He sent the message and waited quietly.

After a moment, a long string of replies came, all voice messages.

Song He long-pressed the screen, converting the voice messages to text and then translating them.

Dewitt: "When I was young and looking for a job, a friend told me the military was recruiting mathematicians to do cryptography research, and the salary was very high. I devoted myself to studying it for a while, but later, for some reason, the high-paying recruitment disappeared, and I couldn't become a cryptography expert, so I was forced to become a mathematician."

Dewitt: "Later, I delved deeply into number theory, algebra, probability, and statistics. Whenever I made progress, I would apply it to the field of cryptography, trying to create something novel. Consider it one of my hobbies."

Dewitt: "The first half of this notebook contains many cryptographic variations I created myself, and the second half is my attempt to create a new mathematical language."

Song He: "A new mathematical language based on cryptography?"

Dewitt: "Yes, I named it Dewitt Language. Currently, no one in the world fully understands this language."

Song He: "Shouldn't there be one person who understands it?"

Dewitt: "Are you talking about me? Although I created Dewitt Language, it was created when I was in my prime. In the last twenty years, my brainpower has declined severely, and I can't even calculate many of the deeper grammars myself."

Dewitt: "I left some Dewitt Language messages in certain pages. If you study the beginning well, you will be able to understand those messages and read out some words that will surprise you, even including a treasure map."

Dewitt: "If you never understand it, keep it safe and pass it on to your students in the future. I hope that one day, descendants will understand my messages and find my buried life's work and secrets."

Song He: "Your disciple will remember! I am still young and believe I will be able to understand Dewitt Language in the future!"

Dewitt: "It's not that I'm trying to discourage you, nor am I being arrogant, but with your current aptitude, understanding it is really too far away. In my prime, my brainpower was at least twice as strong as it is now. If there were some machine in the world that could measure a person's mathematical ability, I would have scored 100 when I was young, and now I would only score 50 at most."

Song He was shocked. He knew that brainpower would decline with age, but was the decline really so great? Cut in half?

He thought for a moment and found Deng Puhe's chat box.

"Teacher Deng, I was just chatting with Teacher Dewitt, and he said that his brainpower is only half of what it was when he was young. I wanted to ask if you feel the same way?"

After waiting for a moment, he received a reply, also a voice message.

Middle-aged and elderly people seem to be particularly fond of using voice messages, probably because they are too lazy to type.

Deng Puhe: "Dewitt is dying quickly, I'm still a ways away from death, so my brainpower hasn't declined that much."

Deng Puhe: "If my peak brainpower was 100 points, it's probably around 70 now. The initial ideas for my award-winning achievements sprouted thirty years ago, and the important ideas were made twenty years ago. These years, I've only been patching up and advancing the details, perfecting the ideas from my youth. I won't have such good ideas again in this lifetime."

Deng Puhe: "Why is the Fields Medal limited to those under 40? Do you understand now?"

Deng Puhe: "Hurry up and work hard, young man! You made rapid progress in the pre-Spring Festival sprint class, but those were just child's play problems. The problems coming up next will be more intense!"

Song He: "Okay, Teacher! I'll study like crazy!"

Putting down his phone, Song He secretly broke out in a sweat.

The problems before the Spring Festival were just child's play difficulty? Deng Puhe, don't be so scary! The child's play difficulty almost killed me!

While the Fields Medal Sprint Group hadn't started classes after the Spring Festival, he studied hard day and night. The holiday was a great time to widen the gap!

Currently, there were two main directions of study:

Dickens's papers!

Dewitt's cipher book!

Song He initially planned to switch between them, alternating the direction of study every hour.

By the next morning, he realized that alternating by the hour was impractical.

Once he delved into a problem, it would often take two or three hours to get out, and his thoughts would spin rapidly. It wasn't something he could stop just by saying so!

It was like a speeding car suddenly stopping, the driver would only break the seat belt, smash the windshield, and fly out!

Song He tried to stop abruptly twice to switch the direction of study, but as a result, his thoughts couldn't change lanes at all. His eyes were fixed on the cipher book, but his mind was filled with Dickens's papers. His mouse was flipping through Dickens's papers, but all he could see were cipher machines clicking and whirring.

He had no choice but to stop setting a time limit and switch to another direction when he was tired of studying one, doing as he pleased.

The holiday lasted until 8:00 PM on the eighth day of the Lunar New Year.

The long-silent Fields Medal Sprint Group popped up with a message, and Deng Puhe threw out a photo of a handwritten problem!

"Spring Festival holiday is over, let's start the class!"

"The following questions are some good ones that Dewitt and I encountered when we were young. They can greatly exercise your thinking ability. Even Dewitt and I winning awards owe a great deal to these thinking-expanding questions!"

"But these questions are difficult for both of us to solve now. If you can solve them, your level will be close to our current level!"

Dewitt also jumped out to speak: "I'll give everyone two weeks! If you can't solve them within two weeks, Deng and I will explain them to you again! If you want to win the Fields Medal, solving these questions in two weeks is the passing line!"

The students in the group spammed a series of "received".

Song He licked his lips, his eyes tense and excited, like a wild wolf preparing to attack its prey!

The questions before the Spring Festival were generally solved by the group members in a few days, and he even solved all the questions in just two days. Now the time span is extended to two weeks, which shows the difficulty of the questions!

The more difficult the question, the bigger the experience pack, and the faster the upgrade!

After examining the question several times, he put pen to paper and began to calculate with elegant and wild handwriting:

"Given that the sequence f is a multiplicative function, the value at the prime power of A1A2 is expressed as..."

"From the Hessy Inequality, the A1A2 definition of μ can be obtained as..."

"The constraint power function u can be expressed in the form of Dirichlet convolution..."

"From the Dickens Jump Number Formula, the Dickens Domain of Δ is..."

While calculating, Song He gave a surprised "Eh".

Scanning the scratch paper in front of him, a short page of paper used a lot of Hessy and Dickens's exclusive theories!

It seems that the papers of these two group members have something to them. The traditional route is not impossible to solve, but using their terminology can simplify more than half of it.

Very good! I like scholars who create mathematical tools. The more tools, the faster the speed of opening mountains and splitting seas!

The murderous intent on Song He's face became even stronger, and his eyes accelerated his writing bloodthirstily, like a wolf about to pounce on its prey, hormones exploding!

At the same time.

Peking University Mathematics Department, Deng Puhe's office.

Piles and piles of books and documents filled the entire office like a publishing house warehouse.

Some of the files in the far corner have not been touched for at least seven or eight years, and the dust on the top is thick enough to grow chives. The files near the desk are scattered, with fresh handwriting.

Deng Puhe sat behind the desk, holding his mobile phone, typing with a frown.

"What kind of plane are you up to?" Deng Puhe sent a message to Dewitt.