America: I came here to study, not to show mercy.

Chapter 46: The $100,000 That Can't Be Lost
I flipped through the records and found that it was indeed that woman named Sufeil.

└Thanks for your offer, but no thanks. ┐
Li Xiaoen pondered for a moment and typed a reply.

He just wanted to stay away from that woman Sufeil as much as possible. The promises he had made were already too many, so he wouldn't make himself uncomfortable by adding another one.

He has enough money to eat and drink, and he is destined to have plenty of it in the future. There is no need to make himself unhappy now.

After fiddling with his phone for a while, Li Xiaoen slowly frowned.

He tried every method but couldn't transfer money online, which made him feel a little upset.

So how did Victoria and the others transfer the money? Could it be that they had the ability to use money in this beacon of freedom?
Just as I was thinking about it, a message from Sufeil came on my phone.

└Don't you want to borrow as much money as possible? $100,000 for a promise, you're making a killing! ┐
"Ah……"

Li Xiaoen couldn't help but sneer. "A deal is about both parties getting a price that satisfies their expectations. Unfortunately, my promise may not be worth mentioning to you, but for me, a hundred thousand isn't enough."
After replying to the message, Li Xiaoen put his phone directly into his trouser pocket, said hello to Daniel and the other two, got up and went straight to the nearby bank.

It took a full two hours to complete all the procedures and return the full $100,000.

Why is it so convenient for them to transfer money?

Li Xiaoen felt helpless. The efficiency of the Bank of America staff was really poor. Coupled with the queue, he wasted two hours of his time in the whole process.

True, he could have doubled his deposit and then paid it back without anyone noticing, but once it was spent, it was spent.

Since he has been rejected, he will definitely not use it. He cannot deceive himself. Everything is just for the sake of expressing his feelings.

Although it was difficult, he finally managed to gain some momentum. Li Xiaoen sighed and called up the control panel.

【Current deposit: US$219608.34】

【Deposit Double Card (2:03:34): After use, all deposits under the host's name can be doubled.】

Li Xiaoen: “???”

Li Xiaoen couldn't help but look back at the bank he had just come out of. He almost doubted that his idea of ​​going in to get a refund just now was just an illusion.

He checked the details on his phone and found that just two minutes after he refunded the money, another sum of US$100,010 was transferred in.

While Li Xiaoen was staring blankly at the details on his phone, a new message popped up above.

└A promise. ┐
"..."

Li Xiaoen couldn't help but take a deep breath. He could even imagine the contemptuous look on Sufei's face when he sent this message.

└Are you sick? ┐

At this point, even Li Xiaoen, who thought he had a good temper, couldn't help but feel a little angry and started typing curses.

This troublesome woman was really pestering him.

After waiting for a while and seeing that there was no reply from Sufeil, Li Xiaoen put his phone back into his pocket.

Because of that woman, the joy of becoming a 100,000-millionaire in seconds by doubling the card was greatly diluted.

Why, it feels like I'm just eating free food.

Li Xiaoen felt very uncomfortable. Seeing that it was too late to go to the bank to get a refund, he simply used the double card first.

[The deposit doubling card was used successfully, and the host's deposit doubled. The current deposit is $439216.68]

Shaking off this annoying thing from his mind, Li Xiaoen called Daniel who was still in the dormitory.

We bought some dinner for four people and then drove back.

After practicing and eating dinner intermittently, and studying for another two hours, Li Xiaoen went straight to the gym.

[State 2: Virtual Sports Card (40%): While this state lasts, the host's fitness gains are doubled, significantly improving physical training results]...

on Monday.

In calculus class, Li Xiaoen tried to transfer one thousand dollars back to Malcolm online, and surprisingly it worked.

Does this mean that the amount of money that can be freely spent online is different for each card and each person?
Li Xiaoen was secretly discussing this in his heart, when he was suddenly pushed by the classmate next to him. He came to his senses and saw that dozens of people in the classroom were looking at him.

No, how can anyone be noticed with so many people in the classroom?
Li Xiaoen felt helpless, and raised the hand holding the pen to signal under the gaze of the middle-aged male teacher with graying hair.

There were about 50 students in the freshman calculus class, which was more basic, and there were usually few opportunities for the teacher to ask questions. Unexpectedly, he had one.

Here, you generally don't need to stand up to answer questions.

"This classmate..."

The man nodded and patted the blackboard. "Please answer this question. This function, defined on the interval between 0 and 1, takes 1 at all rational points and 0 at all irrational points. Without using the language of measure theory, how do you explain why it is non-integrable within the framework of Riemann integration?"

Li Xiaoen looked up and saw a violently oscillating curve drawn on the blackboard. If it wasn't a classroom, many people would think that it was a naughty child scribbling on the blackboard.

This test involved the definition of the Riemann integral, which Li Xiaoen had already understood by self-study. He carefully considered his words and began:
"Using the Riemann integral, when we approximate the integral value by using a finer segmentation, the Darboux upper and lower sums must converge to the same limit. This means that the amplitude of the function we are seeking must be suppressed by an infinitesimally fine segmentation in the neighborhood of almost every point."

"And this function jumps infinitely between 0 and 1 within any small interval. So no matter how finely divided, the amplitude in each subinterval is always 1, causing the upper sum of the Darboux function to always be 1 and the lower sum to always be 0, so it is not integrable."

"The essence of the Riemann integral, in my opinion..."

After answering the question, when talking about this, Li Xiaoen couldn't help but talk about his feelings when he was studying on his own. While thinking about his feelings, he suddenly found that everyone was looking at him, and the whole classroom was as quiet as if there was no one there.

"..."

"You go on."

The teacher at the blackboard raised his chin curiously.

"Um……"

Li Xiaoen considered his words carefully. "Just relative to my own feelings... the essence of the Riemann integral should be to limit the amplitude of the function's oscillation, or in other words, to tame it."

After saying this, Calculus teacher Alaric was stunned for a moment, then nodded seriously.

"Hmm... basically, that's correct. It even surprised me a little."

The more he thought about Li Xiaoen's summary, the more Alaric couldn't help but nod repeatedly. He looked at Li Xiaoen carefully, and then he came back to his senses.

In the American ABC, he could tell at a glance that the young man in front of him should be an international student from China.

Chinese students are generally good at mathematics. He still clearly remembers that his good friend recruited a Chinese student who won many competition awards for him and would show off to him every time.

Is it his turn this time?
"What's your name?" Alaric asked.

"Lee Sean."

"Um……"

Alaric nodded. "Even if you're studying on your own, you still have to listen carefully in class. The teacher might even touch upon some key points you missed while studying on your own."

"..."

Why does this sound so strange?
Just as Li Xiaoen frowned in confusion, Alaric looked up at the other students in the classroom and said, "Okay, what Xiaoen just said is the definition of the Riemann integral. It doesn't matter if you don't understand. Let's talk about it in detail and sort it out..."

Feelings, you're asking me to answer a question before even explaining the definition?

Only then did Li Xiaoen react.

(End of this chapter)