The Last Alchemist

After Irene's matter was settled and everyone sat down by the campfire again, Rosen asked curiously: "Veronica, so you were hiding behind the tree just now?"

Veronica knelt by the campfire, staring at it without blinking, her face as cold as the ice and snow in the dog days of summer, as if Rosen owed her hundreds of thousands of silver rondes. Hearing Rosen's words, she whispered: "No, I was attracted by the loud noise of the doomsday iron ball. I just arrived when Irene fell to the ground."

Rosen asked again: "Oh~ If you arrived earlier, would you stop Irene from killing me?"

Veronica thought for a while and replied: "I'm not sure, maybe, maybe not, it depends on my mood at the time."

Rosen smiled: "It's a good thing you were a little late."

After saying that, he saw that Veronica's face became even colder. He knew that the other party must be in a very bad mood, especially with him, and was definitely very dissatisfied.

This state is likely to cause her to be passive and lazy. If she is passive, Rosen will not be able to trust her, and the conditions they have agreed on will become empty talk.

He has to find a way to ease the relationship between the two sides.

After thinking about it, Rosen took out a piece of parchment from his waist bag, picked up a thin piece of black charcoal from the campfire, quickly smeared it on the parchment for a while, and then handed the parchment to Veronica: "Here you go."

"What is it?" Veronica was stunned, but still took the parchment and took a look. Her eyes were attracted by the content on the paper.

After reading for more than ten minutes, she raised her head, and the coldness on her face had turned into disbelief: "You actually calculated the volume formula of a sphere, this is really a miracle!"

Rosen smiled slightly: "Is the method clever?"

Veronica seemed to have completely forgotten the previous unpleasantness. She was immersed in the world of mathematics, and her eyes carefully looked at the deduction process of the parchment: "Indeed. I can see that you borrowed the concept of 'limit' again. Before, when you used the method of squaring the circle to calculate pi, you used a similar method."

Rosen nodded: "Indeed. I found that the concept of 'limit' is very interesting. I have a hunch that through the extension and development of the concept of 'limit', it is even possible to deduce a new branch of mathematics."

In fact, this branch is calculus, a mathematical tool invented by Lord Niu and Leibniz at almost the same time, which is one of the greatest achievements of human wisdom.

It can be said that calculus is the most important key to open the modern scientific world, and no matter how much praise it gives, it will not be excessive.

Hearing this, Veronica was completely fascinated. The look she gave Rosen was no longer cold, but became extremely warm and even had a hint of admiration.

"Rosen, you have wisdom that ordinary people can't reach. I believe you can do it."

As soon as she finished speaking, Anne coughed lightly: "Veronica, whether you believe it or not, Rosen can do it!"

This woke Veronica up. She realized that she had lost her composure, and her face suddenly became very cold again. She glanced at Rosen coldly and snorted: "Don't try to seduce me with mathematics. From now on, in addition to protecting your safety, I won't say a word to you!"

Rosen shrugged: "As you wish."

After a while of silence, he took out a piece of parchment from his waist bag and said to Anne beside him: "Annie, come here, I tell you, I not only calculated the formula for the volume of a sphere, but also the formula for the surface area of ​​a sphere. Come and see, it's very interesting."

Annie has learned a lot of knowledge from Rosen this month, especially when she saw the power of alchemy, she attaches great importance to mathematics and learns very quickly. Now she can understand some simple mathematical deductions.

She looked at the parchment and her eyes lit up: "Is this the formula for calculating the surface area? So simple."

"Haha~ Although the result is simple, it is not easy to deduce. Look here, for..." Rosen spoke, his voice became softer and softer. In the end, he leaned close to Anne's ear and whispered to Anne.

Veronica had been eavesdropping with one ear erect, but she couldn't hear it all of a sudden. But she was very curious about the formula for the surface area of ​​a sphere. In fact, she had thought about the problem of the surface area of ​​a sphere before, but no matter how she calculated or deduced, she could only get an approximate result.

Now, Rosen has the precise calculation formula at hand, but she can't see it. She just feels like there is an ant crawling around in her heart, tickling her heart, but she can't get it, not to mention how uncomfortable it is.

Finally, she couldn't help it and said angrily: "Rosen, don't go too far!"

Rosen raised his head and said in astonishment: "What's the matter? Didn't you say not to seduce you with mathematics?"

"You" Veronica was speechless, but her face was very cold, just like the cold wind in December, and it seemed that she was about to explode.

Rosen stopped when he saw that it was going well, and hurriedly said: "Veronica, you are a very trustworthy person. Last time, you took the trouble to get the griffin acid sac back for me, and I was sure of this."

Veronica's face eased a little: "You are sensible!"

Rosen continued: "Look, we have reached a contract. I let Irene go, and you will protect my safety. You will definitely not break your promise, which means that we have to get along for at least 40 or 50 years, right?"

Veronica took a deep breath and nodded slowly: "Yes!"

"But you have been so cold-faced and made the atmosphere so tense. How uncomfortable it would be to live like this for decades." Rosen spread his hands, looking helpless.

"What do you want to say?" Veronica heard something.

"What I want to say is that if you sacrifice your freedom to protect me just to protect Irene, you must be wronged, and I have taken a big advantage."

Veronica's face improved a lot: "You still have some conscience!"

"So, to make up for it, I promise you that you will have the first right to know about any new results or even new ideas I get in mathematics during my lifetime. What do you think?"

This sentence hit Veronica's weak spot. In fact, she was finally able to agree to Rosen's conditions, not only because of her good friend Irene, but also because she had the intention of secretly learning mathematics from Rosen.

Now, Rosen had made this point clear, and he had hit the mark on her secret thoughts.

"real?"

"It's absolutely true, high-five me!" Rosen stretched out his hand.

"Pah~" Veronica reached out and touched it, then extended her hand to Rosen: "Show me the parchment in your hand."

Rosen laughed and handed over the parchment.

As soon as Veronica got the parchment, she went to look at the formula. When she saw the formula for the area of ​​a sphere, she compared it with the approximate calculation formula she had derived, and then sighed longly: "Simple, exquisite, really It’s so beautiful.”

This feeling is like drinking a sip of sweet spring in the desert, it is indescribably wonderful.

Then, she went back to watch the deduction process. The more she watched, the more fascinated she became. In the end, she was completely focused on the parchment, completely indifferent to the movements of the outside world.

At this time, if Annie secretly shot her in the back, she would definitely fall down.

Seeing her like this, Annie leaned into Rosen's ear and whispered: "Okay, I can see that this woman is an idiot. No wonder you feel relieved about her."

"Hehe." Rosen smiled proudly.

Annie changed her tone: "However, the way you look at her is obviously wrong. I have to remind you that she is a very powerful monster, and her origin is unknown. Don't have any thoughts about her, it will kill you."

Rosen scratched his head, slightly embarrassed: "Annie, you are thinking too much."

Beautiful woman, appreciate it, it is human nature, he will stop here, and he is clear about this.

"I hope so."

Annie sighed, rolled up the thick bearskin, and curled up on the ground: "I'm going to bed, and I have to travel tomorrow. You should also go to bed early."

"Yeah, okay." Rosen also rolled up the bearskin and lay down against Annie's warm body.

A night of silence.

Early the next morning, Rosen opened his sleepy eyes and looked at the big tree aside, only to find that the high-level vampire Irene was nowhere to be found.

"Don't look, she's gone."

Veronica's voice came from beside her.

Rosen turned around and saw Veronica holding a branch in her right hand and parchment in her left hand, writing and drawing on the dirt.

"You didn't sleep all night?" Rosen asked in shock.

Veronica smiled slightly: "I can stay awake if necessary. As for sleep, when I am bored, I will close my eyes and take a rest."

Rosen clicked his tongue when he heard it. He even saved sleep. It was really amazing.

After that, Sister Mary and others woke up one after another. Rosen took out the meatloaf and dried fish, divided one portion each, and then announced: "From now on, Veronica will be with us."

Sister Mary was now completely numb to the magical things that happened to Rosen, and she just responded with an 'oh' when she heard the words.

Little Alice looked at Veronica and praised sincerely: "Sister, you are so beautiful."

A simple sentence put Veronica in a good mood. She patted little Alice's head gently: "The little girl still has bright eyes."

After saying that, she looked at the meat pie Rosen gave her with disgust and wanted to throw it away, but she was a little hungry and had no choice. She took a small bite and chewed it a few times, her eyes lit up: "Rosen, what good stuff did you add in it to make it taste so fresh?"

"It's an alchemy item. It's non-toxic and its function is to freshen it up. How about it? Not bad, right?"

Veronica nodded repeatedly: "Hmm~ It's really a good thing. When we get to Berkeley, this delicious potion alone can be sold for a lot of money. But speaking of the City of Freedom, you guys are going all the way north to Berkeley. Right?"

This issue was a bit sensitive. Rosen and Anne looked at each other, and Anne said, "If you believe her, just talk to her. Maybe she can help."

Rosen thought about it for a moment and then said: "Actually, I went north this time to detoxify myself."

Veronica was startled: "Detoxification? You look alive and kicking, don't you look like you were poisoned?"

Rosen lowered his voice and said at a volume that only three people could hear: "It's vampire poison, also called blood seal magic. A gift left to me by Viken."

As he spoke, he pulled down his collar, revealing the healed scar on his neck.

After seeing the scar, Veronica patted her forehead and said distressedly: "Rosen, I'm afraid you will be disappointed."

Rosen was startled: "How do you say that?"

"As far as I know, only the undead can unlock the magic of the undead. The blood seal magic in you must be unlocked either by the caster himself or by the ancestor elder of the caster. In addition to these two, There is no third option.”