What's Wrong with the Witch

　　Euclid looked at the bookshelf area expectantly.

　　Last time, he borrowed "Theory of Mathematical Research in Black Magic" here, and the harvest was very rich, and the growth in strength was even more unimaginable.

　　If he hadn't learned a few magics in "Theory of Mathematical Research in Black Magic", Euclid would not have much confidence to leave the barren city after entering the inner world.

　　To give the simplest example, the magic he learned from it, such as darkness perception and darkness shielding, directly greatly improved Euclid's survivability in the inner world.

　　When encountering the grotesque lord, the grotesque lord did not find Euclid, and Euclid discovered the other party first.

　　If you can't beat it, you can run. If you beat it, touch it and kill it, and collect the materials by the way.

　　These two skills alone made Euclid an incredible amount of money.

　　Therefore, even if His Highness Mu Qiqi does not give any remuneration every time he issues a quest, he will be willing, as long as he has the opportunity to read the magic books on the shelf to learn more magic, it is enough.

　　"Which book do you want?"

　　Mu Qiqi walked to the bookshelf area and asked by the way.

　　Euclid, the "mathematician", is a very reserved category for guests who come to the café.

　　This kind of guests basically do not take the initiative to go to the bookshelf area to pick up books to read, they need to be recommended.

　　To a certain extent, he is somewhat similar to Mr. Black Trench Coat, and he always speaks "…………", and other people probably cannot communicate with him at all.

　　I thought of Mr. Black Trench Coat unexpectedly. It seems that I haven't been to the Magical Girl Cafe for a long time.

　　"Principles of Mathematical Magic."

　　Euclid stood not far away with nervous anticipation.

　　In the last "Black Magic Mathematical Research Theory", Euclid was confident that his mathematics research would go well, but he did not expect that the mathematics involved in the magic in the book was so out of line that he didn't learn much in the end.

　　At this time, Euclid realized that, as a mathematician of modern education, using these foundations to study this kind of advanced magic is still a little too big.

　　He lacks the basic magic theory of mathematics too much.

　　It just so happens that there is a book "Principles of Mathematical Magic" written by the legendary magician Russell on the bookshelf of His Royal Highness Mu Qiqi. He believes that as long as he masters this book, he will gain more to study "Theory of Black Magic Mathematics Research" next time.

　　In addition, together with "Principles of Mathematical Magic", there is also "Principles of Magical Geometry", it would be better if they could be borrowed together.

　　Because this book is also the work of the legendary magician Russell, it is also the foundation of the foundation.

　　"This one? Okay."

　　Mu Qiqi looked over.

　　This is the bottom layer of the bookshelf, and the books placed here have accumulated several layers of dust.

　　Later, after the maid Naia and Bubbles cleaned up regularly, the dust on these books was removed. I didn't expect Euclid to notice these books.

　　"Principles of Mathematical Magic" by Bertrand Russell.

　　There is also a copy of "Principles of Magical Geometry" by Bertrand Russell.

　　This author is considered a predecessor of Jonathan Abramovich and has opened up many unique fields in mathematical magic.

　　The difference is that the mathematical magic researched by Bertrand Russell is the foundation of the foundation, revealing many secrets of magic and mathematics, and putting the theory into practice.

　　It's just that his book focuses on defining concepts, revealing principles, etc.

　　简单说明下，就好比罗素在书里写了很多1+1=2，1+2=3，这让读者看起来一目了然。

　　可是，该怎么证明1+1=2，1+2=3，这种事情就不是一般人能理解的了。

　　In particular, Russell's "Principles of Mathematical Magic" starts from logical calculus and adds three magic axioms to the magic logic axioms: the axiom of infinity, the axiom of multiplication and the axiom of reducibility.

　　These three magic axioms seem to hide endless secrets.

　　For example, the magic language of the axiom of infinity is this:

　　?N: φ∈N∧(?x: x∈N=>x∪{x}∈N)

　　Informal magic language statement: There is a magic element set N such that the empty set is in N, and as long as x is a member of N, the union of x and its one-element set {x} is also N member.Such sets are sometimes called inductive sets.

　　An inductive set is a set X with the property that for all x ∈ X, the successor x' of x is also a magic element of X.

　　……

　　Speaking of which, these books were specially collected by Mu Qiqi after getting several magic books from Jonathan Abu.

　　At first, I thought that if I didn't know advanced mathematical magic, there should be no problem in learning some basic mathematical magic. Later, Mu Qiqi found out that she was wrong, and it was outrageous.

　　As a result, "Principles of Mathematical Magic" and "Principles of Magic Geometry" were thrown at the bottom of the bookshelf by Mu Qiqi.

　　After thinking for a while, Mu Qiqi took out "Principles of Magic Geometry" and put it on the bar: "I'll lend you this one too, for the same three months."

　　Seeing the two magic books on the bar, Euclid's eyes lit up.

　　His Highness Mu Qiqi must have discovered that he also wanted to read "Principles of Magical Geometry".

　　It's just that the magic book here is not something you can read together if you want to. You must know that just carrying a magic book on him can bring him extremely terrifying pressure.

　　how to say?

　　It was like walking with an indescribable god on his back.

　　Euclid was very aware of his own limits, and it was enough to qualify for the opportunity to study one of them.

　　"Thanks to the store manager for his kindness, I can just read one of them."

　　"Well, that's fine, I'll keep this one first. After you finish reading "Principles of Mathematical Magic", then read this "Principles of Magical Geometry"."

　　Mu Qiqi nodded and put the "Principles of Magic Geometry" back.

　　Euclid held the "Principles of Mathematical Magic" in his hands like a treasure, and seemed to be eager to read it.

　　Soon he remembered something very important: "Manager, a cappuccino, full sugar, and a delicious cake."

　　"Ok."

　　Mu Qiqi lit the alcohol lamp on the side and started making coffee.

　　As for the delicious cake, take it directly to the bar, and Euclid takes it back to the empty table in front of the bar.

　　While eating the cake, Euclid watched "Principles of Mathematical Magic", and soon became immersed in the joy of learning.

　　……

　　"Mr. Geraint, nice to meet you!"

　　In the Rodent Bar, a middle-aged man who looked similar to the owner of the Rat Man Bar Su walked towards Geraint.

　　Because in the magic city, the Rat Man Bar was destroyed due to unknown reasons, which directly led to a huge vacancy in the mysterious market in the magic city. After several market research and testing, the Mi boss came here to open this store. Rodent Bar.

　　Although it is the old city, it is adjacent to the new city, and the security is very good. The location is remote enough but there are few grotesque haunts, which is suitable for him to open a bar here.

　　"Nice to meet you, sir! But we should meet for the first time."

　　Apocalypse Knight Geraint smiled and looked at the Rat Man in front of him.

　　The last rat man bar was destroyed, which directly caused him to lose a lot of intelligence sources.

　　As for the reason for the annihilation, Geraint can probably guess the truth. It is nothing more than that he asked Boss Su to arrange for someone to go to the Dream Realm to "rescue" Captain Lance. As a result, Captain Lance failed to save him. Instead, he let the Rat Man The bar is targeted by the Lord of Dreams.

　　It was originally a rat who was begging for a living in the sewers, and he provoked the Lord of Dreams several times, and his fate was predictable.

　　Death, in a sense, is a blessing to Boss Su.

　　Fortunately, Boss Su didn't seem to think that it was his reason until he died, which made Geraint breathe a sigh of relief.

　　Because if Boss Su confessed everything, Geraint didn't think he could escape the sanctions.

　　Now, he received an order from Dr. Charles Grace, one of the four doctors of the apocalypse, to come to the capital to conduct some investigations, and naturally he found this rodent bar.

　　Surprisingly, the acquaintance across from him seemed to know him.

　　This intelligence capability is quite powerful.

　　"My cousin is Boss Su. He has repeatedly praised Mr. Geraint that you are a generous knight." Boss Mi said with a smile, "So I recognized you as soon as you entered the bar. "

　　These mice!

　　Geraint smiled: "Indeed, I need to know some special information about the Auyan Research Center."

　　Auyan Research Center?

　　Hearing the name, Boss Mi's body was slightly startled: "Mr. Geraint, please come here first."

　　Geland nodded: "Yes."

　　The two walked into a secret box and sat down separately.

　　Boss Mi smiled and said, "I didn't expect Mr. Geraint to want to know about the Auyan Research Center. I happen to know some inside information about this research center, but not much."

　　Not much to say, but the latter words stopped just right.

　　Geraint understood, he took out a black bearer bank card and put it on the table: "There are 50 here."

　　Boss Mi looked at the 50 on the table, didn't say anything, didn't do anything, just moved his body a little inadvertently.

　　Ah, what a bunch of cheap and greedy mice.

　　Geraint took out a golden bearer bank card and placed it on the table.

　　This time, Boss Mi's eyes seemed to glow, and his fluffy hands stretched out directly from his long sleeves, ready to grab the golden bearer bank card on the table.

　　"Want the money? Tell me all the information you know."

　　Geraint held down the golden bearer card.

　　Boss Mi tried to smoke, but unexpectedly found that he couldn't shake it at all.

　　In an instant, his attitude changed again: "I'm so rude, Mr. Geraint, I hope you won't take offense!"

　　Just now, Boss Mi sensed a terrifying demigod from Geraint.

　　The Paladin of Mysterious Sequence 4!

　　This is one of the powerful professions that has natural restraint on the Rat Man, and he can't help but change his attitude.

　　At the same time, Boss Mi cursed Boss Su, who had been in the morning, and the information provided to him was not complete. Is it clear that he wants to kill his cousin?

　　"It's nothing, Boss Mi, please tell me what you know."

　　Geraint did not take back the golden anonymous bank card, but just sat back leisurely and waited for the other party to tell the information.

　　Boss Mi nodded again and again: "Aoyan Research Center, this is a mysterious organization that studies turning people into grotesques, but people are the main body..."