Xu Yi was interested, just because everyone in number theory was interested in the problem of number theory.

As for the Heavenly Sword, it was also a difficult problem in his eyes.

Since the day of the fight, under the guidance of the Green Demon King, he has cultivated the Armillary Sky Sword of the Three Domain Sources, but he has never been able to break through to the four domain sources, the highest realm of the Hun Sky Sword.

The reason why Xu Yi was obsessed with the fourth domain source was because when his aura was replaced, he had used the Heavenly Sword to hit the four domain sources, but it was destroyed in an instant.

This fact proves that the Heavenly Sword is capable of deriving the Fourth Domain Source.

The reason why it has been delayed for a long time is that the edifice of the mathematical model has not reached the point of being round and consistent.

Of course, Xu Yi still focuses on the practice of these two sets of exercises.

The method of light smoke step is what he urgently needs at the moment, naturally it has spent the greatest thought and energy, and the results achieved are also the most significant, Xu Yi believes that it will not be long before he can build all the skeletons of light smoke step.

In addition to studying the exercises, he also studied all kinds of classics and notes, including cultivation notes, harmful methods, anecdotes, and even geographical anecdotes, all-encompassing, and reading everything.

The second is the study of the medicinal properties of herbs.

The herbs were mainly focused on refining the three kinds of dispensing of Yuan Dan, which took a lot of time and did not make much progress.

Especially in the exchange meeting of the Communist Society, he also did not fall on the field, and occasionally Jinglong and Dong Qingke would also send alchemist experts like sycophants to give him special lectures.

But alchemy itself is a practical project, and the effect is not great just by saying.

Xu Yi thought that once the cultivation of the light smoke step broke through the bottleneck, he could start experimenting with the elixir.

The third is to refine the Yuan Dan, and he is persistent in this process.

Previously, he had done a test, and his limit was to refine seven pieces a day, and he would get tired.

It was impossible for Xu Yi to refine Yuan Dan in a day, and he would fall into a state of recuperation without doing anything.

Therefore, he controlled the number of Yuan Pills he refined every day to six, which not only ensured that his body would not fall into a period of exhaustion, but also set aside time for other things.

Fourth, it is inevitable to accompany the little guy, the little guy has recovered his body, his energy is terrifying, and he is a wood plant elf, this world, there are many masters, Xu Yi is not at ease with Qiuwa, he can only make three chapters with him, occasionally accompany her to travel and play, and the rest of the time, change the way to trick Qiuwa to practice hard, the deception words next to it are useless, but as long as you talk about a carp, it can always stimulate Qiuwa's fighting spirit.

Such four blocks almost divided all of his time, and the days passed without panic, but Xu Yi enjoyed this tranquility.

On this day, Xu Yi, who was stuffy in the refining room for three days and three nights, suddenly looked up to the sky and roared, and the charcoal pen in his hand was thrown by him, a huge white paper that had been filled with countless numbers and symbols, fluttering in the air, Xu Yi Xiao, and laughed heartily.

The whistling and laughter alarmed Qiuwa and Huangzu, and one big and one small broke into the refining room.

Xu Yi laughed, "It's nothing, but to solve a problem, but, you two came just in time, Lao Huang, Qiuwa, you run away, I'll chase you, you can go from here to Qingping." ”

Qiuwa clapped her hands and said, "So you want to play a game, okay, okay, old man, let's come on, don't let him catch it, if you are willing to work hard, I will ask Uncle Hu Zi to give you another Peiling Pill." ”

Hearing this, the Wild Ancestor trembled, and his eyebrows opened his eyes and smiled, almost laughing out loud.

He has basically figured out the trick now, it is better to serve a good son, it is better to serve the young lady, no matter how good the son is, there may not be a reward, as long as the young lady is happy, there are basically benefits, and as long as the young lady speaks, the young lady will not veto it at all.

At that moment, Huang Zu and Qiu Wa fled towards the door at the same time, but unexpectedly, the two escaped to the door, and Xu Yi's figure appeared at the door like a light smoke.

The two were startled, one left and one right escaped, and in the next moment, Xu Yi grabbed Qiuwa with one hand and Huangzu with the other.

Qiu Wawu shouted to herself, "Not ready", "Don't count, don't count", and the desolate ancestor was already shocked in his heart.

He has an old and spicy eye, and he knows very well how terrifying the escape method shown by Xu Yi Shicai is, the last to come first, like a ghost, I really don't know that there is such a wonderful escape method in the world.

Xu Yi knew Qiuwa's temper, and just hung her temperament, she naturally refused to end it now, so she accompanied her for a while, deliberately lost a few handfuls, and coaxed her to smile and go triumphantly.

Xu Yi threw a Peiling Pill and the Desolate Ancestor, "This is the third one, Lao Huang, your qualifications are no matter how bad it is, after taking this Peiling Pill, it is time to replace the complete aura." ”

The desolate ancestor held the Pei Ling Pill, and he was happy and ashamed in his heart, first he had no mouth to blame himself, and then he promised again and again that he would no longer disappoint his son.

After the desolate ancestor thanked him for his kindness, Xu Yi sat down on the ground, looking at the manuscript paper all over the ground, and was quite emotional.

The wonder of mathematics lies in regularity, in harmony, in derivation, in creation, in the final analysis, it is a profound truth that permeates all things.

From cause to effect, there is cause and effect, as long as you grasp the profound rules contained in it, you can trace the cause and effect, and there are thousands of avenues, and sure enough, this is the most obvious and easy to grasp.

There is only one general outline and result, and he has recovered the light smoke step alive, which makes Xu Yi sigh at the infinite mystery of the way of mathematics.

At the same time, it also strengthened his determination to continue to climb the road of mathematics.

He thinks that if it weren't for the difference in strength, it didn't reach an incomprehensible level, and the wonder of the light smoke step was enough to overwhelm all the retreats in the world.

This kind of self-confidence does not come from Shicai's small victory over Huangzu and Qiuwa, but from the belief in the wisdom of mathematics.

The mathematical edifice built by the light smoke step almost makes the escape method infinitely close to teleportation.

For example, if a bystander goes from point A to point B, the closest way to walk is a straight line.

The way of walking the light smoke step is to pull the straight line between point A and point B into a circle, so that point A and point B are close and overlap infinitely.

This kind of mysterious means is the intuitive mapping of the magic of mathematics that can subvert the existence of space.

After thoroughly studying the light smoke step, Xu Yi officially opened the alchemy mode.

Before that, he had a prophetic understanding of Meng Fu, and he was going to retreat for a while, and the rest of the people and horses would all arrange for the desolate ancestors to block him.

Xu Yi originally thought that the reason why he was unable to get started with alchemy for a long time was because theory and practice could not be combined.

In other words, as long as he started refining the elixir, he would definitely be able to combine theory and practice very quickly.

But when Xu Yi began to refine the auxiliary of Yuan Dan with dispensing, he found that not only could he not guide practice, but also failed practice could not derive valuable theories, in short, the entire alchemy process was a mess.

Although he used a green stove, he had enough Yuan Dan, and he did not hesitate to open the earth fire.

But the story told him that no matter how much entanglement he had, no matter how good the carriage was, he would never reach his destination if he went in the wrong direction.