The wind was whistling in his ears, and the light and shadow in front of him changed rapidly, sometimes it was the sky, sometimes it was the ground, sometimes it was the house, and soon, Rosen was dizzy, everything in front of him was spinning, and he couldn't see anything clearly.

The only thing he knew, he had been wandering around the town of Sunderland, but he was completely confused in which direction.

'What happened?' I was kidnapped by a monster? Or did the Blood Rose find me? Rosen's mind was a mess.

While he was thinking wildly, Rosen's eyes suddenly went dark, his head was covered by a black cloth bag, and he couldn't see anything, only the whirring wind in his ears.

The strange situation lasted for about twenty seconds, the wind in his ears stopped, the air around him was no longer cold in late autumn, and a faint fragrance entered his nose.

'Thin alcohol molecules, glycerin molecules, and floral notes...... There are not many molecules, but they are very miscellaneous, and they are all kinds of alkenes and hydrocarbons, which is a very high-end perfume. I should be in the house of some wealthy family in Sunderland right now. ’

'Bang Dang~'

The sound of a window closing.

'Whoa~'

The sound of the fabric rubbing when the cord is pulled.

After two sounds, the black cloth bag on Rosen's head was torn off, and the dim candlelight entered Rosen's sight.

His eyes had adjusted to the darkness, and the environment suddenly brightened, and he subconsciously narrowed his eyes and reached out to block the candlelight.

It took three or four seconds for Rosen's vision to return to normal, and he turned his head to look around, and found himself in a richly decorated room, with a bright floor, obviously waxed, a huge picture of a galloping horse hanging on the wall on the left, and a wooden shelf of exquisite workmanship, on which many bottles and jars were neatly arranged, looking like alchemists' material shelves.

Just as Rosen was looking at the room layout, a woman's voice suddenly came from behind him: "Little guy, you look calm." ”

Rosen's heart was excited, and he immediately turned around, and he saw a large desk behind him, on which were placed a large parchment scroll, silver candlesticks, inkwells, and some wooden rulers, compasses, and the like, and behind the table, a woman in dark red ornate leather armor leaned lazily back in her chair, and a quill pen was casually fiddling with it in her hand.

It turned out to be the lady in red I met in the tavern before!

Rosen's heart was cold: "It's over, this must be a high-level vampire, it's really over now." ’

At this moment, the quill in the red girl's hand turned slightly, the tip of the pen pointed at Lawson, and said with a smile: "Introduce yourself, my name is Veronica." ”

Lawson didn't quite understand the other party's intentions, but he knew that high-level vampires were very fond of pretending, and the other party must have made up his mind to tease him.

Although he knew it in his heart, he couldn't resist, and the only way to survive now was to accompany the other party to act, seeing the move, thinking so, Rosen stretched out his hand to touch his chest, and bowed slightly: "Rosen. Laplace. ”

"Hmm." Veronica nodded, then suddenly reached out again, pulled out a piece of parchment from the table, placed the quill on the side of the parchment, and said, "I know that it would be rude to take the liberty of bringing you here, but I can't help but be curious. ”

"Huh?" Rosen was a little confused, and the situation didn't seem to be quite what he expected.

Veronica pushed the parchment in front of her in the direction of Rosen and explained, "It's an explanation of the moth's flight trajectory when it fights the fire." I thought it through, and I realized that you only said part of the principle...... I'd like to ask you to make up the rest. ”

Confused, Rosen glanced at the parchment on the table, which was exactly what he had left behind, with isometric rays and folded lines. Although this is called Veronica, it is already very clear, but because of this matter, is it too much to kidnap him?

Rosen spread his hands with a wry smile: "This ...... I live in the town, and you can come to me at any time, as for spending so much effort? ”

Veronica nodded, "It's a bit reckless, but I don't like going to crowded places." ”

"Then why did you go to the Pigeon's Nest Tavern before?"

"Hmm~ That wasn't my intention, it was because of an invitation from an old friend. Before she left, she left me with a few geometry questions, so I stayed a little longer. ”

"Okay."

He is in a weak position, and the other party has explained to this point, and he can only choose to accept it.

Walking over to the desk and looking at the parchment scroll, Rosen picked up the quill, and before he was ready to put it down, he said, "How do you know I'm not done?" ”

"Intuition. You're acting very confident. I don't think relying on what you write down alone will be enough to support your self-confidence. Veronica reached out and tapped lightly on the parchment.

Rosen noticed that the Lady in Red's hands were very white and delicate, like the hands of a noble girl, and not at all like the brute force that she had to jump up and down on the roof.

Now that he listened to the other party, it seemed that the other party was simply worried about a mathematical problem, and it seemed that it had nothing to do with organizations such as the Blood Rose.

She has a request for me. Looking at her previous performance, her thinking is more rational and more cultivated. Such an existence should not be like Viken, who turns his face when he doesn't go well. ’

Rosen's mind immediately came alive, he didn't start writing, but played with the quill in his hand: "Lady Veronica, you should know that the wisdom of geometry is endless, and these wisdoms are all ...... I have worked hard to study."

Veronica frowned: "Geometry is pure wisdom, and using it for profit is a defilement of geometry......."

Rosen was stunned for a moment, not expecting the other party to say that, but then he remembered an allusion he had seen.

In other words, in ancient Greece, mathematics was a completely metaphysical game of thought, and a student once asked Pythagoras, what is the use of mathematics? As a result, Pythagoras turned to his servant and said that this man wanted to make a profit through mathematics, and gave him a silver coin and sent him away!

Veronica's idea of geometry in front of her is estimated to be similar to that of Pythagoras in ancient Greece.

Rosen thought for a moment and said, "Of course your words are true, and I also admit that geometry is pure and noble, and should not be mixed with any worldly atmosphere. However, I am only a mortal, and I need money to eat and drink, and most of my time is spent geometrically. If you don't give me some reward, I'll starve to death. ”

Veronica pondered for a moment, then finally nodded, "You're telling the truth. So, what do you want? As long as it's not too much, I'll try to be satisfied. ”

Rosen was overjoyed, and raised his hand to point to the wooden shelf full of bottles and cans on the side: "It seems to be filled with alchemy medicine, you are an alchemist?" ”

Veronica shook her head: "I personally like alchemy very much, and I have studied it for a while. But unfortunately, I have no talent for alchemy, and when I study alchemy, I am like a blind man who has broken into the treasury of God...... I didn't like the feeling, so I eventually gave up. As for those medicines, they are just to make up for the shortcomings in my heart. ”

Rosen asked again: "Then you should be very familiar with alchemy medicines, right?" ”

Veronica nodded: "Commonly used or not, they basically know and know their attributes." ”

Rosen said, "Then, I hope to get some designated alchemy medicine in return." ”

"There is no problem, but one problem, you can only take one bottle!" Veronica responded very simply.

"4 bottles!"

"No, 1 bottle."

"Three bottles?"

"1 bottle! No more verbose. ”

"Okay, just 1 bottle, deal."

After receiving the promise, Rosen began to write, but after drawing a line, he stopped moving.

"What's wrong again?" Veronica's willow eyebrows were slightly raised, showing a hint of impatience.

Rosen asked, "Have you studied number theory?" ”

"Number theory? If you're talking about stupid numbers games, I've been working on them for a while. Veronica's face flashed with disgust.

'Uh~~~ Calling number theory a stupid number game......' Lawson was speechless,

Originally, he wanted to explain the natural constants to Veronica, but since she was so disgusted, he had to say something else.

"Looks like you like geometry?" Rosen asked.

Veronica nodded, her chin slightly raised, and her expression was reserved and haughty: "I have always believed that geometry contains the mysteries of nature, such as a circle, which perfectly corresponds to the sun and moon in the sky. ”

Rosen understood, thought for a moment, drew a dot on his parchment again, and then radiated rays at equal angles, unlike before, he had been drawing 36 lines, and the angle between each two rays was only 10 degrees.

Veronica was stunned: "Another beam from equal angles?" ”

Rosen didn't speak, he continued to paint.

After drawing the rays, he deliberately circled the two adjacent rays with a small circle, and then looked up and asked, "Let me ask you, if the angle between the two rays is very small, as small as one thousandth of a circumference, or even one thousandth of a ten-thousandth." So can they be approximated as parallel at such a short distance? ”

Veronica's fine eyebrows furrowed, her eyes were fixed on the drawing, and it lasted for more than ten minutes without blinking, before she nodded with difficulty: "If the angle is really small, it should be ...... It should be possible, right? ”

"Good."

Rosen drew a small circle in the middle of the rays, indicating that it was the moon, and the rays around it were marked as moonlight, and then asked, "Do you agree that the moon is very, very far away from us, unimaginably far away?" ”

"I agree." Veronica nodded.

Rosen continued: "But the moon is also shining, and at night, the glowing moon can be seen as a very distant fireball, right? ”

“....... So to speak? Veronica said uncertainly.

"Because the moon is so far away, when the moonlight shines on the ground, the angle between the moonlight between two points that are only 1 kilometer away is very, very small, right?" ”

"Ah, is that so...... Yes, you're right. Veronica nodded repeatedly.

Rosen immediately picked up: "To borrow the above assumption of approximate parallelism." On the ground, moonlight at two points separated by 1 kilometer, or even 10 kilometers, can be seen as parallel to each other, right? ”

"Uh~~~" Veronica oozed fine sweat on her forehead, there were so many new ideas that Rosen had come up with one after another, and her mind was a little unable to keep up. The only thing that is certain is that she is now confronted with a completely new geometric idea, a very wonderful idea.

This time, after a long time, Veronica reluctantly nodded: "So to speak." ”

Lawson drew a small flying insect between the adjacent rays and said with a smile: "We can think that under the moonlight, the flying insect is not actually a straight line, but also a curve. The difference is that because the moonlight is approximately parallel, this curve has a very, very small arc and is approximately a straight line. As for the fire, because the distance is too close, the fire light is obviously radiating, so the trajectory of the flying insects becomes a clear curve. Do you understand? ”

"Uh~~ Probably understand, right?" Veronica's expression was wooden, as if she had lost her soul.

Rosen continued: "So, we can conclude that flying insects can fly at night because they are guided by light. Now, the light has changed from moonlight to firelight, and the flight path of the flying insects is naturally seriously disturbed...... Do you understand? ”

"......." Veronica's eyes straightened, and she looked at the parchment roll in a daze, and said nothing.

Well, it seems that she didn't figure it out.

Rosen took advantage of the fire to rob: "Look, I've explained it clearly. Now, I'm going to get paid, right? ”

"Wait~"

Veronica suddenly reached out and pressed it on Lawson's shoulder.

Lawson felt a thousand forces on his shoulders, and he couldn't move at all.

'Brush~'

Cold sweat broke out on his forehead: 'Could it be that she was acting before, and now she is ready to turn her face?' ’