Her math skills have been at a bottleneck since last year, and there is nothing she can teach her.

Now she wants to enter the realm of the Great Yan Seeking One Technique, and she has to start counting the inverse yuan, a concept she got from Zhang Heng's "Theory of Calculation".

If she wants to take her counts to the next level, she can only grope for the footsteps left by her predecessors, and cross the river step by step by feeling the stones.

Zhang Heng is indeed an unborn genius, and his daughter-in-law still needs to work hard to compete with such a person.

Li Yue wrote the equation with a pen, and his arm was a little sore, so he stopped and relaxed for a moment, "Huh? When did the husband come? ”

Zhang Yang sat drinking tea, "It's been a while." ”

The couple usually lectures to their younger siblings, Li Yue explains the insights of mathematics, and Zhang Yang tells the children about scientific knowledge and occasionally tells some stories.

The couple has been influencing the children in this way.

Zhang Yang relaxed, put the weight of his body completely on the back of the chair behind him, stared at the dense calculations on the wooden board, and said in a low voice: "Don't be too obsessed, take your time and don't worry." ”

Li Yue nodded slightly, "Well, I have some ideas today, and I want to calculate it backwards, but it backfires." ”

When you enter the realm of high numbers, it is very difficult to advance again, sequences, derivatives, linear algebra.

Today, her field is derivatives.

Zhang Heng's "Theory of Reckoning" can give her some inspiration.

However, due to the limitation of chapters, he did not write much back then, and he needed to find the rest of the fragments scattered throughout the Central Plains.

Seeing her husband's solemn 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." Li Yue stretched her waist, and she would be twenty-three years old after the New Year.

Looking at her demeanor when she opened her hands and stretched her waist, it was no different from when she was a child.

The husband and wife have known each other and relied on each other for so many years, and they know each other very well, she is lying on the chaise longue on the side, "The mutual market in the Hexi Corridor is very good, and the wine in Lishan has been sold out when it arrives in the Hexi Corridor, which has made the aunts step up the arrangements for the brewery." ”

"Well, the effect is so good, but it surprises me, it seems that the people of the Western Regions are still very rich."

There are many windows in the library pavilion, and these windows are lined up, considering that this is on Lishan Mountain, and it will be humid after the rainy season in Guanzhong, so so many windows are decorated.

Thinking that this library was going to be built, the family suffered a lot, and the child was not born at that time.

"Now that the new home has been completed, two years have passed before I know it."

Zhang Yang nodded and said: "Let's make arrangements for the New Year, let your father come to Lishan, and there are some things to discuss with him." ”

Life is life, and career is still busy, especially Datang's diplomatic career.

Even if we ignore the affairs of the DPRK and China, we will not be able to ignore the great cause of diplomacy.

Zhang Yang said worriedly: "Da Shi has attacked Persia again, and Pei Xingjian wrote to express his worries. ”

In the past two years, Li Yue has rarely cared about the affairs of the court, after all, the operation of the village has to be taken care of, and these alone have kept her busy, and it is rare to be able to find time to study mathematics.

After resting for a while, the couple walked out of the library together, and in autumn and winter, the water of Huaqing Pond became clearer and clearer.

It's just that it's so clear that there isn't even a small fish, and there's a stone table by the pool.

The two began to play chess after a long absence, the chessboard was placed, the chess pieces were placed neatly, and a group of younger brothers and sisters also gathered around.

The chess game began to fight, and the chess was played quickly, and the chess pieces of both sides were eaten a lot.

Although Xiao Qingqing couldn't understand it, her uncles and aunts all gathered around, and she wanted to watch it too.

Li Lizhi had no choice but to hug her and watch the fight on the chessboard together.

Li Yue's progress is very fast, and his chess path is more mature than before.

But the fight between the two sides was very fierce, and there were not many chess pieces left on the chessboard, until Li Yue found that there were no chess pieces that could cross the river, and sighed, "After all, I lost." ”

Li Lizhi whispered: "Actually, as long as the imperial sister crosses the river with the black chess horse and takes down those three pawns, she can turn defeat into victory." ”

"Huh?"

Hearing Li Zhen say this, Li Yue's expression perked up slightly, "It seems that it is still a bad move." ”

Zhang Yang looked at Li Lizhen in surprise, this girl's understanding is really good.

"Your Royal Highness, the meal is ready."

Li Yue packed up the chessboard, "Eat first, and let my brother-in-law give you a lecture after taking a nap." ”

A large group of children left laughing.

In the afternoon class, Zhang Yang explained the principle of heat expansion and cold contraction to the children, but in the afternoon, when Li Yue ate a snack, he had a nausea reaction.

The aunt stroked her back and whispered, "Your Royal Highness the Princess, do you have any plans to live?" ”

Li Yue frowned and looked at her husband.

Zhang Yang said with a smile: "You all do your own questions, and I will take your imperial sister to see Doctor Sun." ”

The children are very obedient, and under the arrangement of Xu Hui and Xiao Wu, they can continue to solve the problem.

Aunt Yang said: "Actually, since last month, Her Royal Highness the princess's taste has become more and more serious, and she has some suspicions. ”

Aunt Wang also advised: "If you are sick, Your Royal Highness the princess, you must not underestimate it." ”

Li Yue reluctantly glanced at the plate of fried eggs with scallion oil, and could only let her husband take her hand and go to the medical hall.

Along the way, her expression was also nervous, and when she arrived at the medical hall, Doctor Sun was also very idle recently, and his golden prescription was about to be compiled, and now only pharmacological verification remained.

Looking at the husband and wife, Doctor Sun Shen checked the pulse for a moment, and nodded clearly, "Her Royal Highness the princess's pulse is very stable, her body is well-nourished, and the pregnancy has appeared." ”

Li Yue said in a low voice: "No wonder there is such a dream. ”

Sun Simiao said again: "This has nothing to do with dreams, it's just that if you think about it, you will be worried, maybe Her Royal Highness the princess has already noticed it, but she doesn't dare to judge." ”

Seeing through by Doctor Sun at a glance, Li Yue's cheeks turned a little red, Qiao Shengsheng glanced at Fujun, saw that he didn't care, and even looked at the medical book on the side, waved his fist, and hammered Fujun three or two times angrily.

Zhang Yang put down the scroll and asked, "What should I pay attention to in my daily life now?" ”

Sun Simiao sighed: "I already have a daughter before, this is the second time that Her Royal Highness the Princess is pregnant, so she naturally needs to pay more attention to her daily life, but in the past two years, Her Royal Highness the Princess has been well conditioned, and it will take a while to make plans again, and there is no need to pay attention to it at the moment." ”

When the couple got the word, they said goodbye and left.

Li Yue stroked his lower abdomen, "I really don't know when this child will come out." ”

When he came to a small courtyard next to the medical hall, Zhang Yang saw Mr. Wen Yanbo, who was looking at the wall in a daze.

Take your daughter-in-law and bow to the old gentleman.

Seeing this, the servants on the side also hurriedly saluted the old gentleman.

Back home, Li Yue told her aunt about her pregnancy, and the two aunts immediately began to arrange.

Only Xiao Qingqing was still curious, "Do I want to have a younger brother?" ”

"I don't know if it's a brother or a sister."

Her husband's words interrupted her curiosity, making Xiao Qingqing pout aggrievedly, and she said unconvinced: "It must be my younger brother." ”

Li Yue hugged her daughter, "Yes, it must be my younger brother." ”

The two aunts cleaned up the house again.

"I'm going to make some new clothes."

"In the past, the clothes that Xiao Qingqing couldn't wear could be worn by the child."

"Well, you can save it."

"I'm going to have to clean up another room and come out."

"This side room is good."

……

The aunts' words continued, and they were very attentive.

It used to be like that when their daughters were about to be born, and they are still like that.

The Uighurs sent envoys to Chang'an, and they accepted the jurisdiction of the Tang Dynasty and were willing to build the Heavenly Khan Highway together.

Since the Han Dynasty, the Uighurs had been a formidable force among the northern nomads, and by the Han and Wei dynasties, by the Sui dynasty, their influence had expanded into the Ili Valley.

This tribe, south of Lake Baikal, reached its peak in the pre-Sui period, who allowed them to meet the Tian Khan now.

The Uighurs would congratulate the Tang Dynasty every year, offering cattle and sheep, and under the arrangement of Zhang Daxiang and Xu Jingzong, they would harvest 30% of the cattle and sheep each year according to the surplus pastures of the Uighurs.

The mighty Heavenly Khan did not have any extra money in his hands to give gifts in return, but only salt and scrolls in return gifts to the Uighurs.

Li Shimin gave the name of Tumidu Khan.

The Uighurs had a status recognized by the Tang Dynasty, and they also had their own territory in Mobei, from Gaochang to the current Western Turks, and even the Eastern Turks, these khans who ruled the people of all ethnic groups in various places were all courtiers of the Heavenly Khan, and worshiped the Tang Dynasty as the upper kingdom.

Xu Jingzong and Zhang Daxiang sent people to build the Hanhai Protectorate, and from then on, the jurisdiction of the Tang Dynasty expanded northward to the south of Lake Baikal.

For the Uighurs, salt was what they liked and what they wanted.

But the scrolls are a different story, since the Han Dynasty, after Huo Qubing conquered the Xiongnu, the remaining Uighurs also used Chinese characters.

Writing is still very far away for the current Uighurs, who are not in the habit of writing letters and articles, and the degree of backwardness of civilization is far less than that of the current Tang Dynasty.

Therefore, Zhang Yang felt that Li Shimin gave them the scrolls in the hope of using the Confucianism of the Central Plains to educate the still barbaric Uighurs, which was an attempt to educate some Uighurs in the process of educating the Turks.

In Zhang Yang's view, the Uighurs had obtained these paper scrolls and did not know how to use them, and they might be used by the Uighurs to wipe their butts.

Well, it is possible, because the Uighur Tumidu Khan was an illiterate man.

When a person is in a hurry to get the most out of everything in front of them, and when the Uighurs have nothing to use, they think of the usefulness of the paper, and they find it comfortable to use and continue to do so.

If they really did this, Tian Khan would not care about this kind of thing, and it had already been given to others, so how could there be any reason to ask again.

At that time, the indoctrination of the Han Dynasty was not completed, and the Central Plains fell into war at the end of the Han Dynasty and cut off contact with Guanwai.

This kind of indoctrination was also interrupted at that time, and now Tian Khan is going to pick up this matter again, but he doesn't know that there is no strong educational force, and it is not easy to educate such a barbarian.

The starting point is good, but the process is full of ups and downs.

Zhang Yang put down the scroll, and sighed in his heart that this kind of teaching cause must continue, only Datang is getting richer and stronger, and Datang's diplomatic power can also become stronger and stronger, which is complementary to each other.

Looking at Persia again, under the attack of the big cannibals, it was really lost one after another.

The Persian prince Belus wanted to ask for help from Pei Xingjian of the Anxi Protectorate several times.

Even Ashnadur, who led the Western Turkic soldiers and horses, no matter how brave he was, couldn't stop the surging cannibals.

Zhang Yang wrote a prelude to the Tang Dynasty's aid to Persia, that is, the Persian prince Belus must ascend the throne as the king of Persia and hand over jurisdiction to the Tian Khan of the Tang Dynasty.

This is just the premise, and I inexplicably feel that with the prestige of the Heavenly Khan, it is a very cool thing to use diplomatic power to seize the countries outside the Guan.

After finishing the things in front of him, Zhang Yang put down his pen tiredly, and he didn't know what the situation in Liaodong was.

Li Yifu and Da'an have not sent news so far.

Li Yue sat on the side with cloth shoes in her eyes, her eyes asking for help, "Auntie won't let me wear straw sandals anymore." ”

"Why?"

"It's going to catch a cold, but it's still comfortable at home in straw sandals."

Zhang Yang picked up the straw sandals at the door of the house, took them into the house and looked at them, his daughter-in-law's feet were actually not small at all, they were wider than ordinary women.

I took out my toolbox and made a few holes in the heel of my straw sandals to make an easy heel.

Then cover the front upper with a cotton cloth.

A unique style of shoes is done.

"I call this a slipper."

Li Yue put it on and 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 Royal Highness the Princess, don't move." Aunt Wang lowered her head to observe carefully, and even looked around the front and back, seeing that the shoes were made of straw sandals, but they could also be used to keep warm from the cold.

Aunt Yang also came over to take a look.

Li Yue stood motionless and didn't dare to move, waiting for her aunt's number.

However, the two aunts reached a consensus, and it didn't matter if the shoes were light and could protect them from the cold.

The royal sister has slippers that weigh her feet, and her younger brothers and sisters want it too.

Zhang Yang couldn't stand Qinghe and Dongyang holding one arm by themselves, shaking their arms and begging, so they had to make a pair for their younger brothers and sisters.

But these little conscienceless people went to sleep at night......

Zhang Yang was still making slippers under the oil lamp, his eyes were sour, he closed his eyes for a moment, and continued to sew and mend.

In a small room by the Huaqing Pool, Li Lizhi sat with Qinghe and Dongyang.

The oil lamp in the room had been extinguished, and only the bright moonlight was shining in.

Dongyang saw that the lights in the main house were still on, so he crawled along the Chase Shop, and the rest of his sisters were asleep.

Qinghe said in a low voice: "Sister Huang, I don't want to get married either." ”

Facing the two younger sisters, Li Lizhi comforted, "You can rest assured, the imperial sister said that we can only marry when we are twenty years old." ”

"What if my father decrees it?" Dongyang whispered his concerns.

"At the beginning, I was also going to be married by my father, but my sister and brother-in-law helped stop it."

"Well, brother-in-law and sister Huang will definitely help us."

Several little girls in the room had firm eyes.