Chapter 215: Tangency theorem

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Tsinghua’s campus is very large.
How big is it. For example, if you want to walk around the entire Tsinghua campus, one day is definitely not enough!
Fortunately, the location of Cheng Nuo's dormitory is not far away from the freshman registration.
Xu Lang introduced various buildings on the Tsinghua campus to Cheng Nuo on the road, and sent Cheng Nuo to the dormitory downstairs after about ten minutes.
"Hey, this is your dormitory building. It was just built this year. If nothing else, you will live here for four years. Of course, except for studying abroad." Xu Lang introduced to Cheng Nuo.
Cheng Nuo looked up.
Brand new dormitory building, seven floors, about 20 dormitories on each floor.
Seeing Xu Lang turning around to leave, Cheng Nuo said, "Senior, don't you go up with me?"
"No." Xu Lang paused, and he couldn't help recalling the tone of Cheng Nuo's saying that "the seniors are all juniors" just now. The chrysanthemum tightened inexplicably, sneered, and waved to Cheng Nuo in a hurry. Leaving.
"Why did you run away?" Cheng Nuo was confused.
Carrying the suitcase, Cheng Nuo walked into the dormitory building.
"203, this is it." On the second floor, Cheng Nuo walked to the door of No. 203 dormitory and gently opened the door.
There are already people in the dormitory.
Inside the door, outside the door, eyes facing each other.
The man slowly stood up, staring at Cheng Nuo blankly.
"Cheng Nuo?" The man was excited.
"Who are you?" It was still a familiar opening.
"This is Yuan Hua!"
At this time, a sad music sounded.
Snow fluttering~~
Howl of the North Wind~~
The world is vast~~
"I'm sorry, I call." Yuan Hua made an apologetic gesture to Cheng Nuo and answered the phone, "Hey, mom, yes, I've already arrived at school.... Well, my roommates are here too... Mom , Guess who I saw? It’s Cheng Nuo! Cheng Nuo big guy!!! What I said, this year’s college entrance examination champion, I admire him so much! I didn’t tell you, I am determined to become Cheng Nuo’s man !... Hmm, that's it, hang up."
Yuan Hua hung up the phone and looked at Cheng Nuo, who was still standing outside the dormitory, and said to Cheng Nuo embarrassingly, "Come on, Cheng Nuo, please come in, please!"
Cheng Nuo walked into the dormitory with his suitcase and looked at the environment inside the dormitory.
Standard quadruple room with bed and table. There are balcony, bathroom, central air-conditioning.
As it is a newly built dormitory building, the beds, desks and so on are brand new.
Overall, not bad!
"Cheng Nuo, is it really you?" Until now, Yuan Hua still didn't believe Cheng Nuo appeared in front of him so real.
Moreover, it is his roommate.
In this way, it took another step before he became Cheng Nuo's man.
After all, the next month comes first!
Cheng Nuo smiled while taking his things out of the suitcase, "How about it?"
"I heard that you were admitted to Tsinghua University. I thought you went back to the Department of Mathematics, but did not come to the Department of Finance first!" Yuan Hua sat on his stool, first sighed, and then wondered. Asked, "By the way, Cheng Nuo, I heard that your college entrance examination math is the only full score in the country, why not go to the math department?"
"Sister...no academic atmosphere." Well, Cheng Nuo almost missed it.
"No academic atmosphere?" Yuan Hua scratched his head in confusion.
As far as he knows, the Department of Mathematics at Tsinghua University is one of the most academic departments.
"Ahem!" Cheng Nuo gave a dry cough and changed the subject, "By the way, how about the two of them, haven't they come yet?"
Cheng Nuo said, of course, it was their other two roommates.
"Oh, this." Yuan Hua said, "The two of them have been here long ago. Now I go to the school store to buy some thermos, washbasins and so on. By the way, Cheng Nuo, have you brought these things? If so, I will ask them to bring a set back to you. Based on time calculation, they should have just arrived at the mall now."
"Bring me a set."
…………
Twenty minutes later...
Cheng Nuo's other two roommates walked into the dormitory with a lot of things.
"Sister, with so many things, I'm exhausted!" A chubby boy weighing at least two hundred and fifty pounds upwards put a lot of things on the ground, and then sat down on a stool, panting.
"It's okay." The other is a boy with brown-black skin, his black hair is slightly curly, and his bulging biceps demonstrate his strength.
"This school is too big, right? The shopping mall closest to our dormitory has to be walked for more than ten minutes." The little fat man still complained, "I knew it, I won't come to Tsinghua! It's too special to cheat you!"
"Okay, okay. Let's not talk about it for now. Now that the people in our dormitory are all here, let's get to know it first." Yuan Hua clapped his palms to attract the attention of the other three.
"I'll come first." Yuan Hua was the first to introduce himself, "Yuan Hua, from Eastern Guangdong Province."
"Zhong Dun, from Hu Jian province." The little fat man took out a bag of potato chips, squeezed and ate it, and looked at Yuan Hua.
"Cheng Nuo, from Dongshan Province." Cheng Nuo introduced herself with a smile.
Finally, the brown-black-skinned boy said, "I am from Xinjiang, Uyghur, my name is Maimedi-Naransebutaijier Nur Amuqi!"
Cheng Nuo three people: "???"
Brother, are you sure, what you said is the name?
"Uh... what? Can you say it again?" Cheng Nuo slowly said.
"I know you can't remember. To tell the truth, my name is long in our Uyghurs. You just call me McGrady." McGrady shrugged and said with a smile.
"Then we will call you McGrady from now on!" The three said in unison.
"Come on, eat potato chips, eat potato chips." The little fat man Zhong Dun handed the potato chips to the others.
The other three grabbed a handful each, and when he took the potato chips back, his hand accidentally shook and one potato chip fell to the ground.
The little fat man was taken aback. When he was about to throw the potato chips that fell on the ground into the trash can, he was called by Cheng Nuo.
"Why didn't you eat it?" Cheng Nuo asked, pointing to the potato chips in the little fat man's hand.
The little fat man looked dumbfounded, "It fell to the ground, it's dirty!"
Cheng Nuo was serious, "Who said that the potato chips are dirty when they fall on the ground."
"Isn't that the case?" The little fat man continued to be confused.
Cheng Nuo shook his head and smiled faintly, "Then I ask you, is the shape of potato chips a curved surface?"
The little fat man is still good at maths, otherwise he won't be admitted to Tsinghua University. He nodded, "Yes."
"Is the ground a flat surface?" Cheng Nuo continued to ask.
The little fat man continued to nod~EbookFREE.me~A curved surface is in contact with a plane, is it tangential contact? "
"Tangent contact means that the two faces actually only intersect on a line. And the area of ​​a line on a two-dimensional plane is equal to zero. Right?"
"Did a potato chip fall on the floor dirty? It's dirty, how dirty it is, how dirty is a thread, what is the area of ​​a thread? It equals zero! So, he is not dirty!
"Even if it is turned upside down, or inserted upright on the ground, it is the same. It only crosses a line and the area is zero!"
Cheng Nuo shrugged and came to the final conclusion, "So, for potato chips, something that has a curved surface, no matter how it is dropped on the ground, it will not be dirty. Pick it up and you can still eat it."
"I call this theorem... the tangency and eating theorem!"
The little fat man took the potato chip that fell on the floor and looked at Cheng Nuo blankly.
I read little, don't lie to me!