Chapter 591 Ouroboros

In any school, examinations and study are always the eternal reservations.

Hogwarts is certainly no exception. No matter how many changes have taken place in the castle this semester, it is still a place where knowledge is imparted, and when the end of the semester approaches, the end of the semester with exams will not change.

According to the theory that everything is number proposed by Pythagoras, everything is wonderfully related to numbers. Therefore, before studying the world, analyzing mathematics first is undoubtedly a clearer and simpler path.

Although there is still a lot of controversy in the current academic world on this point, it is undeniable that using mathematical thinking to sort out and find the connections between things is indeed an extremely efficient and smart way - for example, Explore the connection between study materials, time patterns and final exam questions.

Elena picked up the pile of messy and worn parchment papers on the table and carefully spread them out on the floor of the room in chronological order. According to different subject categories, there were long lines of test papers.

These papers all come from the Room of Requirement in the corridor next to the "Piano Room", opposite the tapestry of "Troll Beats Barnabas."

This is a secret magic room that exists in Hogwarts Castle. It does not have a fixed form, but changes according to the needs of the seeker - whether it is a toilet, utility room, training room, fun room, study room, etc. Restaurant, weapons room...

But for Elena, what she needs is not a special room, but to find the final exam papers that Hogwarts students have intentionally or unintentionally hidden in the Room of Requirement over the years.

Hiding and destroying final exam papers is a very common behavior in any school.

After all, except for a very few top students, not every little wizard is willing to put his final exam papers in his suitcase at the end of the semester and take them home to share with his parents and siblings.

Using the two constraints of "a place where things are hidden/a place where test papers are hidden" for review and screening, Elena accurately found all the papers she wanted from the garbage dump-like Room of Requirements to verify her conjectures. .

"Sure enough, I knew it was like this..."

Elena looked at the past questions on the ground and said softly.

According to the definition in preface theory, parallel mappings of finite sets must have finite solutions, and order-preserving mappings located on consistent complete lattices have sign-preserving properties.

In other words, the seemingly infinite set of test questions on the limited set of textbook knowledge points will inevitably converge as the time axis lengthens, that is, there will be repeated solutions.

Of course, the above is how ordinary Muggles know and understand the world.

From the perspective of a wizard who does not learn (infinite) mathematics (mathematics), that is, wherever the professor has highlighted the key points, it is the scope of the final exam questions.

Although... this focus range is usually about the same as the textbook in the hands of young wizards.

Even before traveling through time, Elena had done a lot of research and speculation on Hogwarts' education system.

A large part of this lies in the fact that the wizarding world's rate of replacement of basic education textbooks is incredibly slow.

The most obvious example is that in the original book "Harry Potter and the Half-Blood Prince", the teaching materials used by Harry Potter in the Potions class in 1997 are actually the same as the teaching materials used by Snape in the Potions class in 1976. Totally consistent.

Not only the title of the book, but even some basic errors and cumbersome methods have not been revised or re-edited in more than thirty years. This is simply unimaginable in the non-magical world during the same time period. things.

In addition, both the "Standard Spells" series and the "Elementary Transfiguration Guide" are works left by wizards hundreds of years ago, and they have not changed at all over the years.

Compared to "History of Magic" compiled by Elena's "grandma", it is a rare textbook that has been revised diligently.

Leaving aside the problems that using the same set of textbooks for a long time may cause in the quality of education, for the professors at Hogwarts, the examination questions at the end of each semester are also a headache.

You know, unlike those schools in the non-magical world, Hogwarts has a serious shortage of manpower in terms of educational resources. Each professor has to deal with at least 5-7 grades of young wizards.

This means that at the end of each semester, they must find time to at least produce a corresponding number of sets of test questions.

"It's really not easy. In a college dormitory system like Hogwarts, we have to find ways to prevent cheating."

Elena looked forward starting from last year's final exam papers and found that the content of each year's exam papers was different from the previous year. It was obvious that the professors at Hogwarts were not lazy enough to only use one set of exam papers to cope with the exam.

Regarding this point, it did not exceed Elena's expectations.

After all, in Hogwarts, students of all grades live in the same dormitory according to their respective houses. If the same set of test questions is used every year, it will be easy for the senior students to miss questions for the lower students at the end of the semester. Case.

"There are seven grades in Hogwarts. If we want to ensure that the lowest level question bank is kept secret, then it means that students in the school will not encounter repeated final exam papers, which means..."

Elena whispered thoughtfully, squatting on the ground and carefully checking and arranging the discarded test papers from the "trash pile" according to the year. As we all know, the simplest mathematical induction is poverty. Lift method.

"1990, 1989, 1988...1985, 1984, 1983...this is it!"

Looking at the similar parchment paper in front of her, Elena quickly stood up and looked at the one at the front that had just been thrown into the "trash pile" last year, separating the two papers that were 8 years apart. The test papers were put together.

From the first question to the last question, all the contents are exactly the same. If the time is covered, it will even make people think that this is the test paper answered by the same class of students, but no matter whether the paper is new or old, or whether it is written at the top of the paper The names of the students clearly verified Elena's conjecture again.

The test papers for most subjects at Hogwarts use a seven-year cycle question bank. In other words, the test paper system used by students who graduated last year happens to be the test paper used by the young wizards who just entered the school this year. .

In this way, the seven academic years of Hogwarts form a cycle like an ouroboros.

Except for the relatively special Defense Against the Dark Arts course, professors in charge of other major courses no longer have to work hard to come up with new test questions every year, and at the same time, they don't have to worry too much about the problem of real test questions being leaked in advance.

He casually took a piece of French caramel pudding and stuffed it into his mouth, feeling the crispy caramel melting little by little on the tip of his tongue. The delicate, smooth, slightly milky but not too sweet pudding touched his teeth coldly. Lina narrowed her eyes in amusement.

"Tsk, I didn't expect that I accidentally found the dark history of two 'acquaintances'..."

…………

The Room of Requirement is located in a corner corridor on the eighth floor of Hogwarts Castle.

It is next to the principal's office, the Gryffindor common room and the Ravenclaw common room. If nothing else, it should be the work of Rowena Ravenclaw, one of the founders. After all, Gryffindor Doesn't seem like such a careful person.

Perhaps because of the unique geographical location of the "Room of Requirement", most of the students who use this place are young wizards from Gryffindor House and Ravenclaw House, which is more in line with the students of the two houses. character.

There are always dangerous items that the reckless Gryffindor cub will try to destroy and discard.

And sensitive Ravenclaw girls will also have many secrets that they want to hide secretly from others.

The two test papers in Elena's hands happened to be one from Ravenclaw House and one from Gryffindor House. What was even more interesting was that the owner of these two final test papers for the first year of Potions class happened to be her. All 'know'.

"Bill Weasley, Qiu Zhang... I didn't expect that these two good students would also fail in the exam. Well, what's more interesting is that this time-spanning confrontation between Ravenclaw and Gryffindor, Unexpectedly, Gryffindor actually won?"

Elena is naturally familiar with Qiu Zhang, Harry Potter's first girlfriend in the original novel and a second-year Ravenclaw senior of Chinese descent, although personally she has never liked her very much. This Chinese senior.

It’s not that Elena deliberately targeted Qiu Zhang, mainly when she learned that Qiu Zhang not only couldn’t speak Chinese, but also lived in the British magical world since she was a child, and her outlook and personal habits were completely the same. The alienation caused by the psychological gap caused by failed expectations after British wizards did not have many Chinese elements except blood.

But studying in the same school, there are still some memorable interactions between the two.

For example...

In the few Quidditch matches against Ravenclaw House during this school year, the silver-white demon soaring in the sky almost effortlessly beat the entire Ravenclaw team to tears.

Among them, Qiu Zhang, who is also a seeker, can be said to be one of the little wizards who cried the loudest.

So much so that every time Elena passed by the Ravenclaw table in the following weeks, she would make several senior girls' eyes turn red instantly.

Except for her own little wings, Elena has always been as ruthless to the cabbage outside as the autumn wind sweeps away the fallen leaves. Moreover, facing this senior sister who has a Chinese identity but has no sense of familiarity, it is really difficult for her. There was so much closeness.

However, Elena has a completely different attitude towards Bill Weasley.

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