Early the next morning, Tingfang went to school to take leave. Although Mr. Kang felt very sad that good students ran away and did not do their jobs, but after all, good students are female students, and there is no way to do it if they don't do their jobs. What's more, Tingfang has always been a cautious person, she has been arrogant for many years, but she has never stepped on thunder. Mr. Kang's statement is naturally not that he suddenly became interested in arithmetic, but that he learned to settle accounts with his eldest sister. For girls, that is the survival skills that need to be mastered, how can Mr. Kang say what he opposes? Fortunately, Tingfang only said that he would take a month off and promised that he would never fall behind in calligraphy, so Mr. Kang felt a little more comfortable. Suddenly, I felt that one or two of the students were not worried, and I was very angry in my chest, and I smoked the rest of the students to death, and the homework was directly doubled, and the brothers and sisters really wanted to die.

Ting Fang, on the other hand, is confined to her home every day to manage all kinds of mathematical knowledge. She is much happier than Xu Jingchang, from elementary school to university, she has received systematic training. Not only are there erudite professors hanging out in the school, but there are also various celebrities on the Internet who are showing off and communicating in the forum. If you have any doubts, as long as you are not top-notch research, it is not difficult to find the answer. Now that there is no network, let alone systematic mathematics, then the mathematical system has to be founded by her, and it is not in vain.

The wisdom of the ancients is still worth learning from. Genius will not be buried in any space in any era. China's science and technology were once ahead of the world, and I want to know that mathematics will not lag behind its contemporaries. It was only later that the power of liberal arts reached its peak, and it was not until the Republic of China lost its teeth that science and technology were thrown away. It's fashionable and not too late. Ting Fang flipped through the mathematical laws summarized by his predecessors, and the words were different, but there were already rudiments of advanced mathematics in many places. By the way, the last few chapters of the "Geometric Originals" were translated with a small part of the speculation. At the same time, as a masterpiece of the Greek period, "Geometric Originals" has many unsatisfactory points, and she has to find a way to make up for them.

No one can solve all the problems of mathematics alone, and science must be like a pyramid of boulders stacked on top of each other, each of which is the greatest man of our time or even centuries. Therefore, due to the limitations of historical conditions, Euclid proposed in the Geometry Prima Geometry that the problem of the "basis" of geometry has not been completely solved, and his theoretical system is not perfect. For example, the definition of a straight line is actually using an unknown definition to explain another unknown definition, and such a definition cannot play a role in logical reasoning. For example, Euclid used the concept of "continuity" in logical reasoning, but this concept is never mentioned in the Geometry Primitives. ①

Ting Fang, who is from the 21st century, can naturally make up for the defects, and after finishing the repair, he carefully transcribes them on paper with a brush and puts them away in a special box, so that no one can touch them. also asked Narcissus to copy it with that bad handwriting, which was given to Xu Jingchang.

Borrowing books is similar to being friends, it always has to be beneficial to each other to last. The preciousness of Western books lies in the fact that transportation is extremely inconvenient, and even if she can ask her family for money, there is nowhere to buy them. In recent years, she has had to point to Xu Jingchang's books to read. Relationships must be built well.

Of course, Ting Fang doesn't need to sort out the whole text before sending it over, a little bit of it, the context is clearly visible. Just a small part of the supplement theorem was written, and a whole stack of paper was written. Attached to the charcoal copper pipe pen that I had obtained, I packed it in a homely box, and wrote Chen Gong's name on it, so that people sent it to the Dingguo Mansion.

Nowadays, sons and brothers are all fox friends and dog friends. The box with the Ye Mansion mark was easily delivered to Xu Jingchang's desk. Xu Jingchang, who opened the box, was almost stunned! He is quite talented in geometry, and he has always been very proud of being able to understand "Geometry Original". But Ting Fang, who is only nine years old, can write all the unfinished meaning of "Geometric Original", which is not an ordinary talent. Xu Jingchang heard his heart pounding, and there was only one thought in his mind - snatch her back! She shouldn't be buried! Thinking of this, Teng got up from his seat, took three steps and made two steps, hurried to the stable, led a horse, and galloped out the door.

Xu Jingchang went to King Fu's Mansion. King Fu is the eleventh son today, and his mother is the daughter of Zhao Shangshu, the official of the Liguo Gong, and the cousin of Xu Jingchang. The two brothers, one is the youngest son of the emperor and the other is the son of the prince, both of whom belong to the category that should be deserved. The two of them live up to expectations, and they are very different - it's okay to run to fight iron and planing wood, you are a cockfighting lackey! The sons of the good guys went down to the ninth stream, and the emperor and Dingguo Gong were not angry and fortune-telling.

King Fu is nineteen this year, because he is a young son, he is not a few years older than the prince's son, and he is not even qualified to mix in the things that the former brother does not deal with. At the age of sixteen, he opened a mansion for him with the saint, and he played craftsman work in the mansion all day long. The saint scolded a few times, but he stiffened his neck and said: "I am the emperor's son, and I have my own food and clothing under the control of the imperial court, and I won't starve to death, what do I want to do?" Your first ten sons are smart and capable, and they are not satisfied, so they have to pull me. Are you so greedy? "Tilt the saint upside down.

The youngest son was reluctant to listen to the scolding, so he had to be out of sight and out of mind. There is also a prince who wants to show his friendship, and he has been used to him since he was a child, and the saint in front of him has collected his guys, so he just hangs tears and snot to find the eldest brother, and he will definitely get a better share. Over time, even Zhao Guifei died of heart, and let him go. King Hengzhu Fu is right, he is the son of the saint, why do you want to be so profound?

When the Duchess of Dingguo was still alive in front of Xu Jingchang's mother, she occasionally took Xu Jingchang into the palace to ask Zhao Guifei, who was only a concubine at the time, and the two little guys were mixed together at that time. Later, the Duchess of Dingguo was gone, and Zhao Guifei often sent people to send things to him. No matter how old he was, he was recruited by Zhao Guifei to go to the palace to accompany King Fu, and the two of them were even more naughty, and when King Fu opened his mansion, it became more and more out of control. The crown prince likes his younger brothers to study and have fun with peace of mind, and the saint doesn't really want his younger son to have a great talent - isn't that a restless house? The prince asked for whatever he wanted from the blessed king on his face, and he often pleaded for the blessed king in front of the saint. The saint also pretended to be angry, but he reluctantly agreed with the face of the prince. The father and son of the heavenly family played each other with King Fu as a prop, and Xu Jingchang also fell into the eyes of the bigwigs. Therefore, although the prince of Dingguo did not like the eldest son, he had to invite him for the position of the son.

Xu Jingchang was used to going to King Fu's Mansion, and the porter was too lazy to report it, so he let him in directly. Xu Jingchang was not polite, went straight to King Fu's study, and kicked the door: "Brother Eleven!" I've got good stuff! ”

King Fu was dozing off, and was startled by Xu Jingchang, and said angrily: "Hurry to reincarnate?" ”

Xu Jingchang excitedly slapped the box of paper sent by Ting Fang in front of King Fu: "Take a look!" ”

King Fu opened the box suspiciously, and there was a pen on it. Pinched it up and studied it and patted it big. Leg praised: "I want to be headed! Where did you get that? ”

Xu Jingchang: "......" doesn't mean you want to look at the pen......

Compared with Xu Jingchang, Fuwang is obviously more fun. If Xu Jingchang likes science and engineering, but he was born in the wrong era, then King Fu is purely idle and finds a rare thing to play, but he is born with a high IQ and can play a little appearance. took the copper pipe pen and took it apart and studied it, and called a eunuch to come in: "Go, ask the workshop to make a more detailed set for the master according to this appearance!" That's all for this year's Hallowe! ”

Xu Jingchang: "......" This thing is sent to the emperor, you can really handle it?

It was easy to read the pen before King Fu saw the paper inside. pinched one up, pouted and said, "What an ugly word!" ”

Xu Jingchang finally couldn't help but roll his eyes: "I want you to read the content, what do you do by looking at the words?" What a good handwriting a nine-year-old girl can write! ”

King Fu also rolled his eyes and looked at the paper casually. However, the more he looked at it, the more surprised he became, after all, he was a rare math master among the younger generation of this dynasty, of course he had read "Geometric Original", even if it was for exquisite naughtiness, he had to deliberately learn it to anger the teachers. Naturally, you can see that the person who writes the manuscript is extraordinary. I swept through the ten lines at a glance, and then went back to savor it, and read it again and again. Xu Jingchang didn't urge him, the two of them made a head together and read it repeatedly. After a long time, King Fu said: "You just said that the person who wrote this is a nine-year-old girl?" ”

Xu Jingchang nodded with difficulty: "Ye Ge's granddaughter, I met at Chongshu Bureau the day before yesterday, and she almost rounded the Western schoolbag we ordered. I was about to tell you, but my son was uncomfortable in the past two days, and I was too lazy to touch his moldy head, so I delayed. There was a question that day, and today this is a thank you gift from her. The purpose is still borrowing our books. "Being compared to the little girl without any suspense, the face is really a little unbearable.

King Fu pondered for a moment before he said, "It's okay to borrow her, in my opinion, she's only stronger than you." ”

Xu Jingchang said: "It's stronger than me, only nine years old!" If you study hard, the future is limitless. ”

King Fu touched his chin and said, "Well, it's a little smaller, otherwise it's not bad to come to my house." ”

Xu Jingchang: Dear. Elder brother! Exactly as I thought!

King Fu said suspiciously: "Why are you staring at me?" ”

Xu Jingchang said calmly: "I think so too." ”

Fu Wang: "......"

"It's a pity it's too small."

Fu Wang: "......"

"Otherwise, it would be fine for any of our brothers to turn her back, as long as we turn her back, we will teach each other."

King Fu: "......" after a long time, he said with difficulty, "Is she a saltless girl?" ”

Xu Jingchang was inexplicable: "When did I say she was ugly?" It's cute. ”

Crouch. Trough! King Fu is not good! You're sixteen years old, why haven't you enlightened yet? When you meet a girl with the right eye, the purpose of turning back is to accompany you to solve arithmetic problems...... couldn't help yelling: "Are you considered a man?" ”

Xu Jingchang, a good friend for many years, finally understood what King Fu meant, and said with great contempt: "She's still a doll!" ”

"She's not nine forever!" King Fu rolled up his sleeves, "Okay, you don't go up to me." ”

Xu Jingchang hehe, calmly made up for the knife: "Your princess, do you choose it yourself?" ”