On the other side, Xia Yu's perception was already hidden, but the strange physical technique was lifted, and his body was like a loach shuttling rapidly through the crowd.

From time to time, his figure rubbed against the corners of some pedestrians' clothes, but he passed through it in an instant, without delaying for a moment.

Here it comes!

Feeling the three perceptual breaths in the crowd behind him, Xia Yu paused slightly, and saw a magnificent high-end material store on the side of the road and plunged into it.

"That kid is heading for the Wasteland Pavilion!" one shouted.

The three figures also chased in, but as soon as they entered the door, they unconsciously put away their perceptions.

It's a taboo to be free to observe others in the store, and they don't care so much on the street, but if they do so on such a high-end occasion, it is provocation.

One of the three was guarding the door, and the other two searched around, but more than twenty minutes passed, and Xia Yu was not found.

In fact, not long after they entered the door, an ordinary middle-aged man followed the flow of people out of the door.

Of course, Xia Yu wearing a mask.

Spring under the medical hall.

Doctor Han looked at the well-preserved five-leaf Qingzhi in the box with satisfaction, and refused to take his eyes off for a long time, before he said: "That's right, black flame soil cultivation, clear dew irrigation, and five-leaf branches, it is indeed five-leaf Qingzhi, and it is very well preserved." ”

"Then please ask Doctor Han to dispense medicine!" Zilan said anxiously.

"Since the two main medicines of Fire Lotus Seed and Five-Leaf Qingzhi have been found, Qingzhi Fire Spirit Paste is naturally no problem. However, this paste configuration needs about half a day, and the girl can come back in the evening. ”

"No need, let's just wait here," outside the door, Xia Yu's voice suddenly came, "Thank you for your hard work Doctor Han!"

Xia Yu ...... You're okay, great!" Zilan cheered happily and couldn't help but go over and take his hand.

Feeling Zilan's concern, Xia Yu did not break free.

Although I was a little worried about whether this "spring down" I heard on the street would be in vain, after all, this five-leaf Qingzhi was not easy to come by, but Doctor Han did not disappoint them after accepting enough Or, and four hours ago, a bottle of white and red ointment with a strange aroma successfully appeared from a small pharmacist furnace.

That evening, when Xia Yu and Zi Lan returned to the hotel with a bottle of Qingzhi Fire Spirit Paste with satisfaction, Mo Luo and Xia Qi were bored eating snacks.

Beside them, a swordfish slanted crookedly on the ground, and I don't know who lost to the side.

"Brother, Sister Zilan, you guys are back, I'm dying of hunger!" Xia Qi shouted as soon as she saw their figures.

"Aren't you eating...... Xia Yu looked at her helplessly, his eyes stayed on her for a moment, and he didn't mention the injury.

He discussed with Zi Lan, since his sister chose to hide herself, then don't say it for the time being, this Qingzhi Fire Spirit Paste is just some kind of elixir found by Zi Lan's elders, and Zi Lan took it to her sister to try.

............

Three days later.

Inside a standard A-class training ground.

Zi Lan looked at the two brothers and sisters who were fighting fiercely in the field, and couldn't help but shake her head.

He didn't expect that Xia Yu would be able to tie with Xia Qi, a little guy who was called a demon by the teachers, in addition to being amazing and glamorous in terms of mechanical skills, and fighting against monks.

Wrong!

In her mind, she recalled the pictures just now, although Xia Yu avoided it dangerously and dangerously, but after thinking about it, it seemed that those few movements that looked awkward seemed to be natural, and it was not Xia Yu's helpless avoidance when he was cornered.

In other words, Xia Yu is actually letting Xia Qi!

This discovery made her a little incredulous, and she couldn't help but ask Mo Luo, who was holding a can of juice next to her in a daze: "Brother Mo, you and Xia Yu have always been together, was he so powerful before?"

"Of course the boss is very good!" replied Moreau without thinking.

"Well, I mean the monk battle side ......."

"Hmm......"

Morrow thought back to the scene when he first met Xia Yu, when the boss suddenly made a move to do something with those damn guys, and it seemed that he had suffered a loss......

However, as long as he thought that the boss had given him a lot of guidance in the research of "black explosive fans", and the effects of the two powerful and used "bombs" were so terrifying, he couldn't help but shudder.

"Boss, always improving. Moreau said solemnly.

"Always improving......" Zilan smacked this sentence, and there were many pictures of getting along with Xia Yu in her mind......

Yes, that's what it means!

Whether it is in terms of mechanical techniques or monk battles, Xia Yu's progress is too great!

If it weren't for his age, Xia Yu's current talent and progress speed, even if he reached the Big Five, would have a much broader prospect than the average apprentice!

It's a pity......

"Huhu...... Brother, let's take a rest," In the field, Xia Qi, who was drenched in sweat, panted, her face flushed, but with a lot of excitement: "Brother is so powerful now!"

"You're making rapid progress, how about it, have confidence?" Xia Yu also gasped slightly.

"Of course, brother, don't worry, I will definitely be able to play my best in the joint entrance examination in two days!" Xia Qi was full of confidence.

When she was in Luo Tong, her level was almost the first place in Dongli Academy.

Before Luo Tong separated, Xia Yu solemnly handed over the "Skyfall Technique" to her and asked her to practice secretly, and in just over ten days, Xia Qi clearly felt that her long-stagnant perception intensity had increased a lot, and now it has broken through 8 meters, and it has also made up for its shortcomings in terms of fineness.

"That's good, let's get here today and have a big meal!"

"Great!"

............

In the next two days, it was confirmed that Xia Qi's hidden injuries had really recovered under the magical effect of Qingzhi Fire Spirit Ointment, and Xia Yu's mood completely relaxed and he devoted himself to his work.

This work is naturally to take the trigonometric and even periodic function theories that have not had time to be compiled into a complete paper.

Before, I was like "cheating", from the trigonometric function obtained from the rotational radian period, and then reversely deduced the core mathematical framework of Qu Shi's entire Xuan arc structure, but I did not completely sort it out.

Only by perfecting this complete set of Xuan arc structure and the mathematical theoretical framework behind it into the original Qu Shi's paper can we not reveal any flaws.

Otherwise, not only would Master Qu not be able to obtain the Divine Emblem, but there would also be a lot of danger for him to propose this by a 2-star apprentice himself.

In fact, as early as Luo Tong's last moment, Master Tong Xian was already urging.

At his point, he really can't wait to see the birth of a new mathematical theory, because each establishment theory represents a further development of the underlying foundation of mechanical arts, and has guiding significance for many other fields.

"Whew...... It's finally done!"

Xia Yu looked at the thick pile of papers in front of him that exuded the fragrance of ink, and quickly read through them again, confirming that there was nothing to revise, and planned to put them away.

Suddenly, he paused, hesitated slightly, and threw the last page of the signature box into the wastebasket.

"I actually forgot Master Dongyuan!"

Perhaps it was the death of Master Qu that made him overly sad and angry, and Xia Yu forgot about Lu Dongyuan, who was also a good person and died generously in the end, just begging himself to keep the results of Master Qu's life's work.

Exhaling softly, Xia Yu put down his pen again.

Title: Several Novel Spiral Arc Structures, and the Magical Periodic Cyclic Function Theory Behind Them.

First Author: Qu Bailing;

Second Author: Lu Dongyuan;

Third author: Xia Yu.