Hua Luogeng is a full professor at National Tsinghua University. He has just returned from studying in the UK and has profound knowledge in the field of mathematics. Luo Wenguang does not want the group of students in front of him to offend Hua Luogeng.
It has to be said that what Mr. Ren announced was a big deal. It was like throwing a huge stone into a calm pond. It immediately caused a huge splash and ripples. Twenty-two students were present in the classroom, including
Everyone, including Yu Hua, was moved by it, and their hearts were full of surprise and shock.
What kind of treatment is it to invite Hua Luogeng, a professor of mathematics at National Tsinghua University, to teach in person?
"That's awesome..." Yu Hua swallowed his saliva and was shocked. He was so impressed by the school's approach. To be honest, he had never seen such a situation. Even in later high schools, professors from Tsinghua University were not invited to give lectures.
situation.
It is no exaggeration to say that this move is unprecedented.
The most important thing is that the person invited by Peking No. 4 Middle School is Hua Luogeng!
The man who will stand at the pinnacle of the field of Chinese mathematics in the future is Hua Luogeng, known as the father of modern Chinese mathematics!
Looking at the reactions of the students, Mr. Luo Wenguang nodded with satisfaction, turned his head, smiled at Hua Luogeng, then stepped aside, motioned to come forward, and then retreated to the door of the classroom.
"Hello, classmates."
Hua Luogeng stepped forward generously and stood in the center of the podium. He looked around and saw a familiar face in the crowd. He smiled and said hello.
"Students meet Professor Hua Luogeng."
In an instant, all the students reacted as if they were waking up from a dream, raised their hands, leaned forward, and bowed to Hua Luogeng on the podium.
"Classmates, sit down. Today I was invited to come to Peking No. 4 Middle School to give a lecture. To be honest, this is my honor, Hua Luogeng. After all, my education level is only junior high school, and all of you here are high school students. I am scared, scared."
With a smile on his face, Hua Luogeng pressed his hands down to signal everyone to sit down. After all the students sat down, he began to speak. There were emotions and expectations in his words, and he couldn't help but joke at the end.
Junior high school education.
Yes, Hua Luogeng, who is a professor at the Department of Mathematics at National Tsinghua University, has only junior high school level education. This is one of Hua Luogeng’s distinctive characteristics.
Hua Luogeng's life can be described as a legend. When he was young, his family was poor and his business was bleak, which made it impossible to maintain the expensive education expenses. Hua Luogeng could not continue his studies and had to drop out of junior high school and return home to help his parents with their business.
However, after graduating from school, Hua Luogeng did not give up his studies. He helped while studying. With the help of his mentor, he completed all the mathematics courses in high school and college in just five years. His talent and talent were extremely terrifying, and his mathematics level was not at all good.
inferior to the mathematics professors in various universities at that time.
With his article "The reason why the solution of the quintic equation of algebra of Su Jiaju cannot be established", the young Hua Luogeng became famous all over the country and caused a sensation in the entire Chinese mathematics community. He eventually entered Tsinghua University as a librarian and began not to explain himself.
A cheating life.
It only took Hua Luogeng seven years to go from librarian to professor of mathematics at National Tsinghua University.
In the classroom, all the students in the Science Class 1 immediately became happy when they heard Hua Luogeng's humorous self-evaluation, and many even laughed out loud.
What a boss.
A self-introduction can mobilize the whole audience.
Yu Hua looked at Hua Luogeng on the podium and sighed in his heart, but there was a trace of unnoticeable envy deep in his eyes. He also hoped that one day he could stand on the podium of No. 4 Middle School and talk like this.
"In terms of academic qualifications, you are higher, but in terms of level, I, Hua Luogeng, am higher, and the arithmetic content I will teach you today is functions." Hua Luogeng pushed up his glasses, picked up the white chalk on the desk, turned around,
Under everyone's gaze, two traditional Chinese characters in regular script were written.
function?
Looking at the two big words on the blackboard, and then looking at Hua Luogeng with a smile on his face, all the students were a little confused.
Yu Hua's face was natural, and his bright eyes were staring at Hua Luogeng, without any doubts or questions, just waiting with peace of mind.
Zhao Anyuan, who was number one in the class, straightened his body and looked focused. He had obviously cheered up. He was holding a pen in his right hand and a notebook appeared on the table.
"Function is the content of the first chapter of high school arithmetic. Today we will not talk about probability and statistics, nor will we talk about the derivatives that are a headache for you. We will only talk about the importance and significance of functions."
Hua Luogeng spoke calmly, neither too fast nor too slowly, and spoke in his own customary way: "First of all, what is the importance of functions? Basics. Looking at all the high school arithmetic books in the past three years, any mathematics section knowledge is all required
Functions serve as a guide. As for what I said, you can review whether when you do questions on trigonometry, analytic geometry, probability and statistics, etc., the questions will involve some function knowledge points."
After hearing the words, Zhao Anyuan nodded thoughtfully, and the other students fell into thinking. After a brief review, they all acknowledged it.
Indeed, as Professor Hua Luogeng said, functions almost run through the entire high school arithmetic line.
Yu Hua heard this and sighed in his heart, Mr. Hua Luogeng is really awesome. In later high school mathematics, functions are the first mathematical knowledge points that are exposed to high school students. It seems simple, but in fact, few students truly understand that functions are actually the entire high school mathematics.
The most difficult math section among them.
Among the mathematics questions in future college entrance examinations, big questions that combine functions and derivatives can make countless students' scalps go numb, and the combination of sequence and inequalities can cause an explosion.
What is a sequence of numbers essentially?
Or a function.
"Function can be said to be the only knowledge point that runs through the entire high school arithmetic. The derivative that troubles you is called the derivative in mathematical language. It is a local property of the function. In layman's terms, the derivative is just a tool of the function. Function abstraction,
There are many changes, which require rigorous logical thinking to understand. It can be extended to the calculus field at the university level, which is of great significance. Which student knows the definition of classical functions?" After Hua Luogeng finished speaking, he looked at the bottom of the podium.
In a flash, all the students immediately raised their hands.
"Just the classmate at the back." Hua Luogeng casually pointed at Tan Qing, who was in the last row.
"Mr. Hui, the definition of a classic function is: for every certain value of x in a certain interval, y has a certain value, then y is called a function of x." Tan Qing, who was looking forward to it, saw Hua Luogeng roll his name.
I, surprised in my heart, quickly stood up, lowered my head slightly, and answered.
Hua Luogeng smiled slightly: "That's a good answer, but what about the modern definition of function?"
"Modern definition of function: Given a number set A, assuming that the element in it is x, apply the corresponding rule f to the element
y, then the equivalent relationship between y and x can be expressed as y=f(x). The concept of function contains three elements: definition domain A, value range B and corresponding rule f." Tan Qing continued to answer.
After Hua Luogeng listened, he motioned for Tan Qing to sit down, picked up the chalk in his right hand, and under the gaze of all the students, turned to face the blackboard and wrote a function question.
Set A={(x,y)|Y=a}, set B={(x,y)|y=bx+1,b>0,b≠1}, assuming that set A∩B has only one subset,
So what is the range of values of the real number a.