Meng Qingqing could leave, but Yang Xuan obviously couldn't.
After persuading Meng Qingqing to leave through telepathy and reminding her not to tell anyone about him, Meng Qingqing reluctantly followed Ling Wudao and left.
However, Yang Xuan was very doubtful whether she was reluctant to leave him or reluctant to leave her snacks.
After Meng Qingqing left, Xie Tianji continued, "Brother Ren, please explain the shadow measurement method."
Yang Xuan didn't want to hide this point, so he explained to Xie Tianji in detail about similar shapes and proportions. This explanation was even more detailed and advanced than the one he explained to Zhang Heng previously.
Xie Tianji obviously understood. After pondering for a moment, he sighed and said, "When I heard about the shadow measurement method, I thought it was a small path. Now that I've listened to Brother Ren's explanation, I know that this is also a big path. Brother Ren's attainments in mathematics are indeed extraordinary."
Then he said, "But I wonder what's the truth measurement method?"
Yang Xuan looked at Xie Tianji and said, "Elder Xie, do you know what the Qingxue royal family used to exchange for the truth measurement method?"
Xie Tianji was slightly taken aback, then his gaze fell on Yang Xuan's finger. He smiled and said, "If Brother Ren still wants a storage ring, my Biyun Sect doesn't have it."
Yang Xuan didn't find it strange that he knew such a secret. He shook his head and said, "Elder Xie must be joking. It's useless to have a lot of storage rings. I only want one thing."
Xie Tianji narrowed his eyes and said, "What?"
Yang Xuan went straight to the point, "Your sect's guest elder token."
Xie Tianji was stunned. He was already prepared to hear Yang Xuan demand an exorbitant price, but he didn't expect Yang Xuan to make such a request.
To be honest, Yang Xuan's request wasn't much at all. On the contrary, it was beneficial to his Biyun Sect. Think about it, a Five Qi Great Venerable would receive honorable treatment no matter which sect he went to. It was simply something that couldn't be asked for. Who would have thought that Yang Xuan would make such a request?
"What's so difficult about it? Brother Ren wants to join my Biyun Sect." Xie Tianji patted his chest and said.
Yang Xuan sighed. He had no choice but to do this. If he did not want this guest elder token, it was still unknown whether Ling Wudao would let him leave. One must know that he still had to dig for spirit stones, and definitely could not stay in the Biyun Sect.
Xie Tianji called someone, after a few words, he turned and left.
Not long after, Ling Wudao walked in and handed a cyan token to Yang Xuan. He smiled and said, "Elder Ren, welcome to my Biyun Sect."
Yang Xuan chuckled and kept the token, not saying a word.
Ling Wudao continued with a smile, "Elder Ren, the token you hold is the highest status guest elder token. It has many rights, which is enough to show the sincerity of my Biyun Sect. I hope Elder Ren won't disappoint my Biyun Sect."
This was already a warning. How could Yang Xuan not hear it? He nodded to Ling Wudao without saying anything.
He didn't want to be caught in the whirlpool between Biyun Sect and Giant Spirit Sect. He just wanted to dig out spirit stones and fly away.
With this Biyun Sect token, it would be much more convenient for him to do things.
Of course, he knew that Biyun Sect could accept his request only because of his knowledge in mathematics and Xie Tianji's face. They might have secretly investigated him long ago, and his identity might even be exposed at any time. This was also the reason why he wanted the guest elder status.
Xie Tianji, who had been waiting impatiently at the side, said, "Brother Ren, now can you talk about this method of measuring Zhou Dezhi?"
Hearing this, Ling Wudao also showed an expression of listening attentively.
Yang Xuan did not beat around the bush. He began to explain the relevant knowledge of pi to the two of them. Of course, he was careful and did not go into too much detail. In fact, he only explained pi to two decimal places, just like what he had told the imperial family of Azure Snow Country.
He had a premonition that this move he had left behind would bring him unexpected gains.
Xie Tianji couldn't wait to start calculating on the ground. Only now did Yang Xuan discover that the limestone floor was already covered in various kinds of messy graffiti. It seemed like Xie Tianji had a habit of squatting on the ground to calculate.
Ling Wudao sighed as he looked at Yang Xuan. Although he wasn't as professional as Yang Xuan in mathematics, he also understood Yang Xuan's explanation.
At this moment, he couldn't help but start to really admire Yang Xuan in his heart.
Xie Tianji checked for a long time, then suddenly stood up and slapped his thigh. He rushed to Yang Xuan and grabbed his hand excitedly. "How did you find this? Genius, you're a genius. "
Yang Xuan thought to himself, "My primary school mathematics teacher taught me."
But of course, he couldn't really say that. He just smiled and pretended to be mysterious.
A few days later, when Yang Xuan was about to leave Biyun Sect, Xie Tianji almost bowed to Yang Xuan as a disciple.
From disdain at the beginning to reverence at the end, in just a few days, Yang Xuan showed the tip of the iceberg in mathematics. Xie Tianji and Ling Wudao were shocked to the point of numbness.
This was especially true for Xie Tianji. He boasted that he was a peerless expert in the field of mathematics, but when compared to Yang Xuan, he was simply a joke.
Any question he raised would always be answered by Yang Xuan in the fastest and most correct way. It was as if there was nothing in the world that could stump him.
In the end, Xie Tianji simply couldn't understand what Yang Xuan was saying.
What Accius, what Aunt Wa, what Sanying, what Sanying, what Sanying, all of them made him confused and happy.
Sometimes, he even wondered if Yang Xuan was talking nonsense. But no matter what question he asked, Yang Xuan could always use these unintelligible words to answer it. He couldn't help but believe it.
He even once heard Yang Xuan say, "The chicken changes, the lotus doesn't change, the talisman …"
At that time, Yang Xuan had only spoken half of his sentence before stopping. Xie Tianji's sharp senses had sensed that Yang Xuan's words seemed to contain some huge secret.
What was the relationship between the chicken and the lotus? Xie Tianji racked his brains.
The middle-aged man who said that Yang Xuan couldn't afford to compensate had long admired Yang Xuan so much that he almost knelt on the ground and called him master.
The reason was that once Yang Xuan accidentally saw him doing an experiment. He casually gave a few pointers and solved a big problem for Xie Tianji. This disciple was so shocked that he didn't dare to act rashly in front of Yang Xuan.
Ling Wudao only listened for half a day before retreating in defeat. This was because in just half a day, he already couldn't understand what Yang Xuan was talking about.
Before he left, he kept thinking about a question in his mind: What was the decomposition prime factor?
He had a premonition that if he could understand this sentence, he would definitely make a qualitative leap in the field of arithmetic.
When Yang Xuan left, Xie Tianji and Ling Wudao directly sent him off to the outside of Biyun Sect. The other disciples of Biyun Sect were stunned and inexplicably felt deep respect for Yang Xuan. At the same time, they firmly remembered Yang Xuan's appearance in their hearts and listed him as someone they must never offend.
How could they afford to offend someone who could make the two big shots of Biyun Sect send him off respectfully?
"Brother Ren, you must go and come back early!"
Under Xie Tianji's reluctant gaze, as if he was looking at his wife, Yang Xuan responded and quickly slipped away. At the same time, he secretly wiped the cold sweat off his forehead.
If he continued, he wouldn't know what to say anymore.
It wasn't that he didn't know how to say it, but no matter how profound it was, he wouldn't be able to use the language of this world to explain it.
In the end, he simply explained some concepts of the unknown directly to Xie Tianji.
At most until the second year of junior high school.
Yang Xuan thought to himself. At this time, he finally knew that it wasn't easy to be a teacher. Sometimes, when he saw Xie Tianji's confused look, he couldn't wait to give him two slaps.
Shaking his head, Yang Xuan tossed the strange thoughts of disappointment out of his mind, and flew in the direction of Green Snow City.
The Pirate Commander was still there waiting for him to continue his great undertaking of digging up ancestral graves.
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