Chapter 172

When the school bell rang, Gu Lu walked around the lecture theater and just walked back to the podium.

At this moment, a boy wearing a white coat and glasses hurriedly walked in.

"Sorry, sorry, teacher, I was sorting specimens in the laboratory and didn't notice that I was late."

The boy apologized to Gu Lu and walked inside.

Suddenly, a unique smell filled the entire classroom.

That smell...

How should I put it, it's very confusing.

It smells like rotten apples, ammonia, and smelly feet.

Three flavors mixed together.

Gu Lu took a deep breath and almost died on the spot.

The other students in the classroom also covered their noses one by one, and their murderous eyes fell on the culprit boy in front of the classroom.

"What does this smell like on you?" Gu Lu asked, covering his nose with his sleeves.

"Does it smell like that?" The boy was stunned for a moment, then he raised his arm and smelled it, then explained to Gu Lu like he was fine, "Oh, it should be the smell of ketones. I accidentally spilled it on my clothes."

Ketone body, a substance found in the urine of diabetic patients.

Gu Lu: "..."

I peed on my clothes. Is this classmate so calm?

Gu Lu waved to the boy, "Hurry back to the dormitory and change clothes. I'll give you half a class break."

"But I still want to go to class?" The boy looked reluctant.

Gu Lu had a black line on his head, "Go quickly!"

The smell of ketones is quite mellow, and it has a lingering aftertaste. The smell of stinky feet lingers on the tip of my nose for days.

If this boy continues to stay here, without even half a class, everyone in the classroom will probably be sent to the hospital due to gas poisoning.

Watching the boy go away, Gu Lu immediately asked someone to open the window for ventilation.

Then I took out the textbook and started teaching.

Gu Lu coughed lightly and began to lecture, "Today we will cover the third section of the differential mean value theorem."

"In the last class, we got to know the four mathematicians Ross, Lagrange, Cauchy, and Lópida."

"After this period of experience, you must have developed strong and hard-to-leave emotions for these four mathematicians."

"Now, I will give you a few questions to test your emotions towards these four mathematicians."

Swish swish swish.

Gu Lu wrote four questions on the blackboard.

Then he showed his white and neat teeth to the students in the audience and said, "For the four questions, please use your knowledge of Ross's Theorem, Lagrange's Mean Theorem, Cauchy's Mean Theorem, and L'Hôpital's Rule to solve the four questions."

"The time limit is fifteen minutes. After fifteen minutes, the class monitor will collect all the students' answers and give them to me."

"This is a casual test. The scores will be included in your usual grades. Take it seriously. Okay, let's start the timer!"

As soon as Gu Lu finished speaking, there were wailing sounds in the classroom.

Gu Lu's surprise test did not reveal Fengsheng in advance, so everyone in the medical school was caught off guard.

But they quickly adjusted themselves, took a deep breath, glanced at the questions on the blackboard, and began to answer.

Fifteen minutes later, under the gazes of several pairs of resentful eyes, the class monitor forcefully took away the unfinished answer sheets from their hands.

"Alas." A boy sighed with a lonely look after handing in his test paper, "I dreamed about Lagrange last night."

The roommate in the same dormitory next to me immediately asked out of curiosity, "Are you so sincere that you want to have a heart-to-heart interaction with Lagrange, the great sage mathematician of the last century?"

"I don't know. I forgot the specific details, but at the end when Lagrange was leaving, he said five words to me with a smile, which suddenly woke me up."

"What five words?"

The boy said word by word with a deadpan expression on his face, "You failed at high math!"

"..."

Seeing that except for the boy who was changing clothes in the dormitory, all the other people's answer sheets had been collected, Gu Lu smiled with satisfaction.

Then he turned around, erased the four questions on the blackboard, and wrote a big name in chalk - Brooke Taylor!

"Today I will introduce you to another mathematician, Brooke Taylor, and his famous theorem, Tiger's formula!"

Many students in the audience couldn't help but look tense.

Taylor formula!

Through the personal experience of blood and tears of many senior students, it has been passed down from generation to generation.

Let them know before they learn this part of knowledge that Taylor's formula is the most difficult part to understand in the entire advanced mathematics volume!

Gao Shu has four generals under his command.

The brave general Fermat, the fierce general Taylor, the fierce general Lagrange, and the tiger general Lópida are known as - Mallegobi.

Among them, Taylor, the fierce general, has the courage to defeat ten thousand people with one enemy.

Under its special skill "Taylor's Expansion", countless candidates burst into tears and fled for their lives.

Even many ordinary universities have excluded Taylor's formula from the examination syllabus.

What should be avoided is that because of Taylor's formula, the failure rate of high-level mathematics courses will increase significantly.

It is indeed beneficial to the school to charge retake fees for failing high school mathematics courses.

But if the failure rate is too high, any university will not look good.

However, for top domestic universities like Yan University, Taylor's formula is not only included in the advanced mathematics examination syllabus, but also listed as one of the key test points.

It is almost a must for every exam.

It is almost impossible to avoid this disaster by luck.

So, there is no other way, just listen to the class carefully!

Almost all the students pricked up their ears and listened to Teacher Gu's narration on the podium.

"Before learning Taylor's formula, I want to talk about two theorems first, namely Taylor's mean value theorem 1 and Taylor's mean value theorem 2. The content of Taylor's mean value theorem 1 is that if the function f(x) has n order at x0

Derivative, then there is a neighborhood of x0, and for any x in the neighborhood, f(x)=f(x0)f'(x0)(x-x0)..."

(The formula is too long and I am too lazy to type it. If you are interested, you can go to page 138 of the first volume of the advanced mathematics textbook.)

Gu Lu also knew that this was a difficult point, so he explained it bit by bit to the students in the audience.

Although it is difficult, most people can still keep up with Gu Lu's pace.

In the back row, a classmate accidentally dropped his pen on the ground.

He lowered his head, picked up the pen, and continued to listen to Teacher Gu's lecture on the stage.

However, gradually, this classmate became confused.

Who am I, where am I, I am taking advanced mathematics class, that’s right!

But why can’t I understand it?

Did I miss some important information when I picked up the pen?

One second, I was picking up a pen in a high-level mathematics class, and the next second, I couldn't understand what was being said.

The classmate didn't know what happened, and he didn't dare to ask.

So, from then on, when the advanced mathematics class was over, this classmate was completely confused and couldn't understand what Gu Lu said.
Chapter completed!