Her math skills have hit a bottleneck since last year, and she has nothing to teach her.
Now she wants to enter the realm of Dayan Qiu Yishu and start to calculate the reverse element. This concept she got from Zhang Heng's "Suan Wang Lun".
If she wanted to take her math skills to a higher level, she could only follow the footsteps left by her predecessors and cross the river step by step.
Zhang Heng is indeed an extraordinary genius, and his wife still needs to work hard if she wants to be on par with such a person.
Li Yue was writing calculations. Her arms felt a little sore and she stopped to relax for a moment. "Huh? When did your husband come?"
Zhang Yang sat drinking tea and said, "It's been a while."
The couple usually gives lectures to their younger brothers and sisters. Li Yue explains mathematical insights, while Zhang Yang tells the children little scientific knowledge and occasionally tells some stories.
The couple has always influenced their children in this way.
Zhang Yang relaxed and put his body weight completely on the back of the chair behind him. He stared at the dense calculations on the wooden board and whispered: "Don't be too obsessed. Take your time and don't be anxious."
Li Yue nodded slightly, "Well, I had some ideas today and wanted to calculate it backwards, but it backfired."
When you enter the realm of advanced mathematics, it is difficult to make further progress, such as sequence, derivatives, and linear algebra.
Today her field is derivatives.
Zhang Heng's "Suan Wang Lun" can give her some inspiration.
However, due to chapter restrictions, he did not write much back then and needed to find the remaining fragments scattered throughout the Central Plains.
Seeing her husband's serious expression, Li Yue asked curiously: "What's wrong?"
Zhang Yang frowned and said, "I'm thinking about how to increase the explosive power under closed conditions."
"It seems that my husband's worries have not been resolved yet." Li Yue stretched her waist. She would be twenty-three years old after the Chinese New Year.
The way she looks when she opens her hands and stretches is no different from when she was a child.
The couple had known each other for so many years and knew each other very well. She was lying on a lounge chair nearby, "The mutual market in the Hexi Corridor is very good. Lishan's drinks were sold out when they arrived in the Hexi Corridor. This has made the aunts step up their efforts. Arrangements for the brewery.”
"Well, the effect is so good, it surprises me. It seems that people in the Western Region are still very rich."
There are many windows in the library, which are open in rows. Considering that this is on Lishan Mountain, it will be wet after the rainy season in Guanzhong, so there are so many windows decorated.
Thinking about the construction of this library, the family was not less affected. The child was not born at that time.
"Now that the new home has been completed, two years have passed before I knew it."
Zhang Yang nodded and said: "Let's make arrangements after the New Year. Let your father come to Lishan. There are some things you need to discuss with him."
Life is life, and you still have to be busy with your career, especially the diplomatic career of Datang.
Even if you turn a blind eye to the affairs of the DPRK and China, it will not work if you ignore the great cause of diplomacy.
Zhang Yang said worriedly: "Dashi is attacking Persia again. Pei Xingjian's letter expressed his worries."
In the past two years, Li Yue has rarely cared about the affairs of the court. After all, she also has to take care of the management of the village. These alone have made her too busy. It is rare to be able to spare time to study numerology.
After resting for a while, the couple walked out of the library together. In autumn and winter, the water of Huaqing Pool became clearer and clearer.
But it was so clear that there wasn't even a small fish, and there was a stone table by the pool.
The two began to play chess after a long absence. The chessboard was placed, the chess pieces were arranged neatly, and a group of younger brothers and sisters also gathered around.
The chess game began to fight, and the chess was played very quickly, and many of the pieces on both sides were eaten.
Although Xiao Qingqing couldn't understand it, her uncles and aunts gathered around her and she wanted to see it too.
Li Lizhi had no choice but to hold her and watch the fight on the chessboard together.
Li Yue has made rapid progress and his chess skills are more mature than before.
But the two sides fought fiercely, and there were very few chess pieces left on the chessboard. Until Li Yue found that there were no chess pieces to cross the river, he sighed, "We lost after all."
Li Lizhi whispered: "Actually, the emperor can turn defeat into victory as long as he captures the three pawns after Black's knight crosses the river."
"Um?"
Hearing what Li Zhi said, Li Yue's expression cheered up slightly, "It seems that the game is still just one move away."
Zhang Yang looked at Li Lizhi in surprise, this girl has really good understanding.
"Your Highness, the meal is ready."
Li Yue cleaned up the chessboard, "Eat first, and let my brother-in-law give you a lecture after nap."
A large group of children left laughing.
In the afternoon class, Zhang Yang explained the principles of thermal expansion and contraction to the children, but in the afternoon, Li Yue had a gagging reaction when eating snacks.
The aunt stroked her back and whispered: "Your Highness, do you have any plans to live your life?"
Li Yue frowned and looked at her husband.
Zhang Yang smiled and said: "You all make up your own questions, and I will take your imperial sister to see Dr. Sun."
The children are very obedient and can continue to solve problems under the arrangement of Xu Hui and Xiao Wu.
Aunt Yang said: "Actually, since last month, Her Royal Highness's taste has become more and more intense, so she has become suspicious."
Aunt Wang also warned: "Your Highness, Princess, must not underestimate her health condition."
Li Yue glanced at the plate of scallion fried eggs reluctantly, and could only let her husband hold her hand and go to the hospital.
She looked nervous as she walked all the way. When she arrived at the medical clinic, Doctor Sun had been very free recently. He was about to complete the compilation of his golden prescription, and now only the pharmacological verification was left.
Looking at the couple, Divine Doctor Sun checked the pulse for a moment and nodded clearly, "Her Royal Highness the Princess's pulse is very stable, her body is well maintained, and she is pregnant."
Li Yue whispered: "No wonder you have such a dream."
Sun Simiao added: "This has nothing to do with the dream. It's just that I have worries when I think about it. Maybe Her Royal Highness has noticed it, but she doesn't dare to tell for sure."
Being seen through by Divine Doctor Sun, Li Yue's cheeks turned a little red. She glanced at her husband and saw that he didn't care. He was even looking at the medical book on the side. He raised his fist and threw angrily at her husband. Hammered three or two times.
Zhang Yang put down the book and asked, "What should I pay attention to in daily life now?"
Sun Simiao sighed: "I already had a daughter before. This is the second time that Your Highness the Princess is pregnant. Naturally, you have to pay more attention to your daily life. However, Your Highness the Princess has taken good care of her body in the past two years. It will take some time before she can do it again." Plan, there is nothing to pay attention to at the moment.”
After the couple got words, they said goodbye and left.
Li Yue stroked her lower abdomen, "I really don't know when this child will come out."
Arriving at a small courtyard next to the medical center, Zhang Yang saw Mr. Wen Yanbo who was looking at the wall in a daze.
He and his wife bowed to the old gentleman together.
The servants on the side saw this and hurriedly saluted the old gentleman on his behalf.
After returning home, Li Yue told her aunt about her pregnancy, and the two aunts immediately started making arrangements.
Only Xiao Qingqing was still curious, "Am I going to have a younger brother?"
"I don't know if he is a younger brother or a younger sister."
Her husband's words interrupted her curiosity, causing Xiao Qingqing to pout aggrievedly. She said unconvinced: "It must be my brother."
Li Yue hugged her daughter, "Yes, it must be my younger brother."
The two aunts tidied up the house again.
"And some new clothes to make."
"The clothes that Xiao Qingqing couldn't wear before can be given to the children."
"Well, save it if you can."
"I still need to clean up the room and come out."
"This side room is nice."
…
The aunts kept talking and they were very attentive.
It was like this when my daughters were about to be born, and they are still like this now.
The court sent another memorial, and the Uighurs sent envoys to Chang'an City. They accepted the jurisdiction of the Tang Dynasty and were willing to build the Tiankhan Avenue together.
Since the Han Dynasty, the Uighurs have been a force that cannot be underestimated among the nomads in the north. After the Han and Wei dynasties, by the Sui Dynasty, the Uighurs' power had expanded to the Ili River Basin.
This tribe south of Lake Baikal reached its peak in the pre-Sui Dynasty, and now they have met Tian Khan.
From now on, the Uighurs would offer cattle and sheep to the Tang Dynasty every year. Under the arrangements of Zhang Elephant and Xu Jingzong, they harvested 30% of the cattle and sheep from the Uighurs' surplus pasture each year as a tribute.
The mighty Tian Khan did not have any extra money to give as a return gift, so he only gave salt and scrolls to the Uighurs as gifts.
Li Shimin gave Tumidu the title of Khan.
The Uighurs had a status recognized by the Tang Dynasty, and they also had their own territory in Mobei. From Gaochang, to the present Western Turks, and even the Eastern Turks, these khans who commanded the people of all ethnic groups in various places were all ministers of the Khan of Heaven. , worshiped the Tang Dynasty as the supreme state.
Xu Jingzong and Zhang Xiangxiang sent people to build the Hanhai Protectorate. Since then, the jurisdiction of the Tang Dynasty has expanded northward to the south of Lake Baikal.
For the Uighurs, salt is what they like and what they want.
But the scrolls are a different matter. Since the Han Dynasty, after Huo Qubing conquered the Xiongnu, the remaining Uighurs would also use Chinese characters.
Things like writing are still very far away for the current Uighurs. They do not have the habit of writing letters and articles, and their civilization is far less backward than the Tang Dynasty.
Therefore, Zhang Yang felt that Li Shimin gave them the scrolls in the hope of using the Confucianism and Law of the Central Plains to civilize the still barbaric Uighurs. This was the beginning of the process of educating the Turks, and he also tried to civilize some Uighurs.
In Zhang Yang's opinion, the Uighurs had obtained these paper scrolls and had no idea how to use them, so they might be used by the Uighurs to wipe their butts.
Well, this is possible because the Uyghur Khan Tumidu was an illiterate man.
When a person is in a hurry, he will maximize the value of everything in front of him. When the Uighurs want to relieve themselves and there is nothing available, they will think of the use of paper, and they find that the process of using paper is very comfortable. , will continue to do so.
If they really did this, God Khan wouldn't care about this kind of thing. He had already given it to others, so there was no reason to ask further.
The enlightenment of the Han Dynasty had not yet been completed, and the Central Plains fell into war at the end of the Han Dynasty, cutting off contact with the outside world.
This kind of education also stopped at that time. Now Tian Khan wants to take up this matter again. However, without a strong educational force, it is not easy to educate such a barbarian tribe.
The starting point is good, but the process is full of ups and downs.
Zhang Yang put down the book and sighed in his heart that this kind of education support business will continue. As long as Datang becomes more prosperous and powerful, Datang's diplomatic power will also become stronger and stronger. These are mutually reinforcing.
Looking at Persia again, under the attack of the cannibals, they lost ground one after another.
Prince Belus of Persia wanted to ask Pei Xingjian of the Anxi Protectorate for help several times.
No matter how brave Ashinadur, who led the Western Turkic troops, was, he could not stop the surging cannibals.
Zhang Yang wrote a memorial stating that the prerequisite for the Tang Dynasty to come to Persia's aid was that the Persian prince Belus must ascend to the throne as the king of Persia and hand over jurisdiction to the Tian Khan of the Tang Dynasty.
This is just the premise. Inexplicably, I feel that it is very satisfying to use the prestige of Tian Khan to use diplomatic power to plunder the countries outside the customs.
After finishing the things at hand, Zhang Yang put down his pen tiredly, not knowing what the situation in Liaodong was like.
Li Yifu and Da'an have not sent any news yet.
Li Yue sat on the edge wearing cloth shoes, her eyes asking for help, "Auntie won't let me wear straw sandals anymore."
"Why?"
"I'll catch a cold, but it's still comfortable to wear straw sandals at home."
Zhang Yang picked up the straw sandals at the door of his house and took them into the house to look at them. In fact, his wife's feet were not small at all and were wider than ordinary women.
He took out his toolbox, punched a few holes in the heel of his straw sandals, and made a simple heel.
Then cover the front section of the shoe with cotton cloth.
A unique style of shoes is ready.
"I call these slippers."
Li Yue tried it on, squinting her eyes and smiling happily, "Well, it's very comfortable to wear."
When she walked out of the house wearing a pair of unique slippers, Aunt Wang stared at her for a long time.
"Your Highness, don't move." Aunt Wang lowered her head and observed carefully. She even looked around and saw that the shoes were modified from straw sandals, which could also be used to keep out the cold and keep warm.
Aunt Yang also came over to take a look.
Li Yue stood there without daring to move, waiting for her aunt's scolding.
However, the two aunts reached a consensus that they didn't care that the shoes were light enough to keep out the cold.
The imperial sister had slippers that fit her feet, so her younger brothers and sisters also wanted them.
Zhang Yang couldn't bear it, Qinghe and Dongyang each grabbed an arm, shook their arms and begged, so he had to make a pair for each of his younger brothers and sisters.
But these little heartless people went to bed as soon as it got dark...
Zhang Yang was still making slippers under the oil lamp. When his eyes became sore, he closed his eyes for a moment and continued to sew and mend.
In a small room beside Huaqing Pool, Li Lizhi sat with Qinghe and Dongyang.
The oil lamp in the room had been extinguished, and only the bright moonlight came in.
Dongyang looked at the lights in the main room and crawled along the main house. The other sisters were already asleep.
Qinghe whispered: "Sister Huang, I don't want to get married either."
Facing her two sisters, Li Lizhi comforted her, "Don't worry, the emperor said we can only get married when we are twenty years old."
"Then what if the father gives the decree?" Dongyang whispered his worries.
"Back then, I wanted to be married off by my father, but my sister and my brother-in-law helped to stop me."
"Well, my brother-in-law and the emperor's sister will definitely help us."
The little girls in the room had firm eyes.
