"The snow is coming tonight, but does the Doctor still have time to visit the poor monk?"

On a snowy night, a light is like a bean.

A monk dressed in a yellow robe, wrapped himself tightly, sat cross-legged on a futon.

In front of him was a bubbling kettle.

The water has been boiled.

Tea has also been prepared.

"A master, Li Yan's overnight visit is really a strange thing I want to ask Mr."

The person who came was Li Yan, the first administrator of the Tang Empire's Guozi Supervision and Accounting Academy, a doctor of arithmetic, and a close adviser to Tang Xuanzong.

Under the shadow of the lamp, his face was solemn and his eyes were respectful.

It is true that he is the first doctor of arithmetic in the Tang Empire, but he also knows that the real astronomy and arithmetic powerhouse in the Tang Dynasty is the person in front of him.

Even, only exceeding, but not exceeding.

Legend has it that the original name of the master was Zhang Sui, the giant deer family. The Yixing family was famous in the early Tang Dynasty, and his grandfather Zhang Gongjin was the founder of the Tang Dynasty, and the official was the official of the country, but when he was twenty-one years old, because he did not want to associate with the nephew of the Great Zhou Emperor Wu Zetian, he was angry and left home, followed the Songshan Zen master Pu Lin to practice Zen, and later followed the good fearlessness and Vajra Zhi to learn tantric methods, and assisted them in translating the important books of Tantra.

However, the most important thing is that Xuanzong is also one of the most outstanding mathematicians in the Tang Xuanzong period, and he is also a peerless in the field of arithmetic.

This is also the original intention of Li Yan to visit his party.

"Oh? Is there anything else in the world that amazes the wise men today? ”

The group looked at the man in front of him, but after being a family, Li Yan's deep study in the fields of arithmetic, astronomy and Taoism also made him deeply admired, both of them were favored advisors by the side of Emperor Xuanzong of the Tang Dynasty, although the two had few opportunities to meet, but the two admired each other for a long time.

"Master, please take a look."

Although Li Yan felt that there seemed to be a faint hint of ridicule in the master's voice, he didn't care, and his line was his senior.

"Is this an arithmetic problem?"

The party took the yellow straw paper handed over by Li Yan, glanced at it briefly, and then raised his head and asked Li Yan opposite.

"Yes, Master."

Li Yan's voice was always respectful.

"Where did you get these two questions?"

His gaze fell on the yellow straw again, and he felt a little strange that the handwriting on the title on the first piece of paper was handsome and powerful, and it should be done in one go, while the handwriting on the second piece of straw paper was real. It's really unsightly!

"Master Hui is a friend of one of Li Yan's students gave him two questions, the first question was dictated by the friend that day, and then handwritten by Li Yan's disciple, and the title on the second piece of straw paper was written by that friend himself."

Li Yan knew that the doubts of the master were not only the title itself, but also the two completely different handwritings.

"Oh, I see—"

The line nodded, and focused his gaze on the papyrus again.

However, the more he looked at it, the more serious he became, the more nervous he became, and in the end, fine and dense beads of sweat began to appear on his ears and forehead, and the fine and dense beads of sweat slowly gathered and became a thin and shallow river.

"Master?"

Li Yan knew that the party might also be trapped by the topic in front of him, so he was so anxious and nervous.

"Have you ever seen anyone who came up with these two questions?"

The line finally looked up from the yellow papyrus.

"I haven't seen it yet, and according to the disciples below, this friend doesn't like to have too much contact with strangers, and according to my estimate, he should be a hermit who has been cultivating for many years."

Li Yan has his own speculation.

"I think it should be the same, such a topic is definitely beyond anyone's imagination."

The line bowed slightly, with a serious expression.

"According to the master, is there a solution to this problem?"

Li Yan looked at the group, although he knew that the master should be powerless, but his tone and expression did not have the slightest hint of teasing.

"Hey, the poor monk has studied this way for many years, but he never thought that there are still arithmetic problems in this world, and besides, there are still two at the same time, ashamed, ashamed!"

Although the line is proud, it is also a rigorous person.

To know is to know, and not to know is not to know.

The Master's education has long been infiltrated in his bones.

"Master, in fact, the disciple below once obtained the solution to the first problem from this friend of his."

Li Yan looked at the line and carefully considered the words.

"Oh? Can you tell me? ”

Yixing is really a great person, and his modest and studious character has been carried out since he was a teenager.

"Of course, if the master wants to."

Li Yan smiled slightly.

A master is indeed a master.

"I want to hear about it."

The master of the line also smiled modestly.

Li Yan got up, knelt in front of the coffee table, found a piece of paper and a pen, and wrote on the straw paper while repeating Huang Xinghe's explanation last time.

"That's it?"

After listening to Li Yan's explanation, their expressions suddenly relaxed, like a deflated ball.

So it's that simple?

And the key is to discover the law behind this question?

Thinking of this, the group couldn't help but laugh. There are really people outside the world, and there are heavens outside the sky.

"What does the master think of the solution to this problem?"

Li Yan saw that the master was smiling so convincingly, and he knew that he was actually in a good mood.

"The poor monk thinks that the person who solves the problem is also the solver, this wisdom and mind is really difficult to stand out in the world, it seems that the poor monk is old——"

Yixing shook his head and laughed.

"That's true, when the younger generation saw this question that day, they were also shocked, and then what followed was the feeling of old age of a hero like the master."

Li Yan also laughed.

On this night, the two peerless masters of the past who did not see the queen and did not see each other, it is rare to sympathize with each other so much tonight, or rather, to sympathize with each other.

It turned out that they had been fighting for half their lives, but as a result, they were killed by a person who had not met so far by an inexplicable appearance.

"As for the second question, has the doctor already figured out the solution?"

When the party looked at Li Yan again, there was no longer the arrogance of the past in their eyes, but the calmness and modesty that was as calm as water.

"Don't hide it, master, if Li Yan had an understanding of the Fa, he wouldn't have taken the liberty of bothering in the middle of the night."

Li Yan looked at the group, and he was also embarrassed.

"The second question, seemingly simple lending, involves the calculation of principal and interest, but, in detail, it is actually quite complicated, if you are willing to spend time, of course it can be solved, just like the first question, but, I believe that the intention of the questioner is definitely not to let us simply add one by one, slowly calculate, there must be some joint points in this, but I did not find it."

After all, a line is a master of mathematics, and this kind of problem can definitely be solved if it is done in a stupid way, but he is a master, and if he can't see the answer at a glance, or see where the trick is, it is a failure.

Presumably, Li Yan must think the same way, otherwise he would not have made a special trip to come to the door on a snowy night to ask for advice.

"It is true that as the master said, if one by one is added and calculated slowly, this problem is not complicated and difficult, but I heard my student say that he also had doubts about it that day, but he saw with his own eyes that this friend of his only took a very short time to calculate the result of the first question, and the junior student also casually came up with the same problem on the spot, and the strange man also opened his mouth without thinking about it, and my student later verified that it was indeed accurate. Therefore, the younger generation thinks that this second question must also be clever. ”

Li Yan is completely consistent with the views of the masters.

"Well, yes, this is even more curious to the poor monk, if my expectations are correct, the person who asked the question must know the answer to this question well, and he must have seen through the heavenly opportunity of this question, so he also knows the relationship between your disciple and you and the poor monk, and his purpose in this question may be to ridicule the poor monk and the doctor?"

One line is indeed thinking a little far-reaching.

However, if Yang Jian knew that he was tonight, he would definitely burst into laughter.

His purely unintentional actions, but he never wanted to torture the two great mathematical gods in the world today, and he was almost depressed!

"The master thinks so?"

When Li Yan heard this, he couldn't help but look at the group of masters in distraction.

The idea of the line is the original intention of him to visit the master!

"Or, we can play a game with this mysterious friend."

The group looked at Li Yan and suddenly smiled mysteriously.

"Games?"

Li Yan was a little confused.

At such an embarrassing moment, how could the master still be in the mood to play games with others?