Veronica's arrival did not surprise Rosen.

Of course, the most important thing is that he has confirmed that the other party is harmless to him, and since this is the case, he naturally will not be disgusted by the appearance of such an eye-catching existence in his bedroom.

He turned around and continued to wipe his cheeks, and after wiping them clean, he put away the cotton towel and rinsed his mouth with the salt water next to him, then he turned around and walked towards the hanger next to the bedroom.

After taking off his fur shoulders and coat and placing them on the shelf, he walked back to the table and under the table, and one hand touched the spiral troll, which turned slightly, and the barrel was facing Veronica.

Although Veronica is currently harmless, she must be defensive.

Fortunately, Veronica didn't know the power of the troll, and her attention was all on penicillin, and she didn't care about Rosen's small movements.

After sitting down, Rosen smiled: "Your prediction is completely correct, and I also expected this kind of ending." ”

'Click~'

Veronica put the medicine back on the table, staring at Rosen with a pair of burgundy eyes: "When you taught that woman to use a glass syringe just now, I happened to be outside the window and heard it clearly. Your treatment for rosemacules is unheard of, but surprisingly effective. What I'm curious about now is, how are you prepared to deal with the risks of going north? ”

Rosen shrugged his shoulders: "I don't know yet. Let's see the move. ”

After speaking, he asked again: "You came to me in the middle of the night, definitely not to marvel at my potion." Say, what's the matter with me? ”

Veronica smiled, "You're the smartest human I've ever met. Talking to smart people like you always saves a lot of time. ”

"Thanks for the compliment."

Veronica took out several rolls of parchment from her leather armour pocket and placed them in front of Rosen to unfold: "A new question. As long as you help me out, I will tell you a very important news. ”

Rosen took the parchment and looked at it, and found that a circle was drawn on it, and a sentence was written next to it: 'How do you find the exact ratio of the circumference to the diameter of a circle?' ’

Isn't that just the π calculation? Rosen thought to himself.

Rosen knew many methods for calculating π, the ancient circumcision, and several formulas for calculating π values. However, knowing is knowing, but in specific applications, π accurate to 10 decimal places is sufficient. As a graduate student in materials physics, he will not be idle enough to use a computer to calculate hundreds of billions of π.

Therefore, the specific calculation formula Lawson can't remember much, and what he can really think of is the ancient circumcision.

Thinking of this, he glanced at Veronica: "Isn't this ratio 3?" ”

Veronica shook her head repeatedly: "No, no, no, I measured it carefully with a rope, and it was definitely not 3, a little bigger than 3, but much smaller than 4." But exactly, I can't figure out how. ”

Rosen thought for a moment, picked up the quill, dipped it in ink, but didn't put pen to paper: "I want to know the news first, and at the same time, I want a bottle of griffin acid." ”

Veronica glared at Rosen, "Why do you always bargain at this time?" Do you know that such a coercion of yours is very annoying! ”

Rosen was unmoved: "If you promise, you will have an answer, if you don't promise, there will be no answer, you choose." ”

"Whew~Whew~"

Veronica was angry, but she couldn't have a seizure, she stroked her chest again and again, and after a while, she barely calmed down: "Little thing, count yourself lucky, I agreed!" ”

If she hadn't agreed to her friend's bet, and she really didn't want to lose to that guy, she wouldn't have given in to a mortal so easily!

'If I find a chance, I'll make you suffer a lot!' She was ruthless in her heart.

Of course, Rosen didn't know Veronica's thoughts, seeing that the other party was so angry, he wasn't worried that the other party would break the contract, otherwise, she could have agreed first, and then play tricks afterwards, there was no need to be so angry.

He drew a rough circle on parchment, then drew an inscribed quadrilateral inside the circle and an inscribed quadrilateral outside the circle. In this way, the diagonal of the inner square is the diameter of the circle, and the length of the side of the outer square is the diameter of the circle.

When he had finished drawing, Rosen took a quill and clicked on the parchment, and said, "I don't know the exact ratio, but I do know that the length of the circumference must be between the sides of two squares, right?" ”

"Yes." Veronica nodded again and again, patting her head while nodding, remorseful and unwilling in her heart: "Such a simple method, why didn't I think of it, it's really damned!" ’

After looking at it for a while, her heart suddenly moved, and she found a flaw: "Wait, what I want is an exact ratio, not an approximate range." And, if you do the math, you can see that the ratio is between 2.8 and 4, which is too big. ”

Rosen smiled slightly, drew another circle, and then drew a regular octagon inscribed and inscribed: "Want to be precise? Yes, you can increase the number of sides of the polygon. The more the number, the smaller the range, and when it is small enough to a certain extent, is it accurate? ”

"Uh~~ Seems to be so." Veronica nodded subconsciously, but for some reason, she always felt that something was still wrong.

After thinking about it for a while, her eyes lit up and she said, "No, no, our deal is that you give me the exact ratio, and then I can fulfill the agreement." But now, you're only giving me the algorithm, but not the exact value, which is not a full fulfillment, so the most I can do is bring you the message. As for gryphonic acid, don't talk about it unless you give me the exact number! ”

After saying that, Veronica looked proud, she has been crushed by Rosen's intelligence, and today she can be regarded as a turnaround.

Unexpectedly, as soon as she finished speaking, Lawson raised the pen and wrote on the paper, she looked at it and found that it was a string of numbers, and she subconsciously read it out: "3.1415926535897." ”

The long list of numbers came out, and the smile on Veronica's face slowly froze.

After Rosen finished writing, he raised his eyes to look at Veronica: "Actually, this ratio is the same as the natural constant, it is a transcendent number, and at the same time it is an irrational number, so it can't be written, but I can give you a ratio accurate to 13 digits." If you don't believe it, you can use the method I just gave you to calculate carefully. ”

His eyes were faint, full of condescending confidence, like a god who held the truth, standing in the clouds, indifferently looking at the mortals groping in the dark.

Veronica sweated on her forehead, and she forced herself to say, "How do you know it's not finished?" ”

Lawson inserted the quill back into the inkwell and said indifferently: "The number of sides of a polygon can be infinite, but no matter how many it is, it can only be close to the circle, and it is impossible to completely coincide with the circle." So, the more edges, the more accurate the ratio, but because the number of edges is endless, there will always be a more accurate ratio. In this way, the ratio must be endless. ”

π is a transcendent number, which has been rigorously proven on Earth, and it would be more convincing if Rosen wrote out the detailed proof. Of course, for Veronica, he said that enough.

Seeing that Veronica was silent, Rosen added: "This is an obvious fact. ”

"I know it's true!" Veronica's face sank like water.

She had been completely convinced, but her heart was happy and annoyed.

I was glad to win a friend's bet. Annoyingly, since she met Rosen, she has been despised by him again and again, but she is completely powerless to fight back, she can only bear it, which is really annoying.

However, although she is very reluctant, abiding by the contract is her bottom line. Now that Rosen had answered the question, she had no choice but to get him a bottle of griffin acid, even if she was reluctant.

But griffin acid isn't easy to get, and to get it, you have to get your hands on the griffin's acid sac, and it has to be an intact acid sac, and you have to kill it before the griffin spits acid!

Veronica almost went crazy: 'Ah~~~ I would hunt griffons for a mortal! Damn it! Damn it! Damn it! Ah~~~~ I'm really depraved! ’

Rosen on the side saw that her face was cloudy, so he didn't open his mouth to continue to stimulate her, and waited until Veronica's emotions recovered on the surface before he spoke: "You just said that you would bring me a message?" ”