"Teacher Tao and Teacher Chen want to eat, I'll invite the teachers to eat!" Zhang Xingchen took the schoolbag from Zheng Tongya's hand and said with a smile. How can I say that I am also in Yanjing University now, and the two teachers have come from afar, so he naturally wants to do his best to be a landlord.

"You are still students, how can there be any reason for you to invite the teacher to dinner. Zhang Xingchen's family situation Tao Li knows best, and the tuition fee for college is still earned by him as a tutor during the summer vacation. I won't let him pay for dinner.

"Teacher Tao, Teacher Chen, Brother Chen is a rich man now, and he got a freshman scholarship when school started, which is 8,000 yuan! Zheng Tongya put his arm around Zhang Xingchen's shoulders and said with a smile.

Yenching University will award the "Freshman Scholarship" to the newly admitted freshmen every academic year, according to the students' college entrance examination results, there are only 30 places every year, which are generally won by the top students in the college entrance examination in various provinces.

"Then it's not your turn to pay, let's go, you choose the place to eat, and we'll pay. Chen Tianxiang couldn't help but say, and pulled them out.

The main campus of Yenching University is located in the prosperous area of Yenching, and the infrastructure around the school has long been very perfect, especially the places to eat, there are countless snacks and larger restaurants.

The four of them walked out of the school gate of Yan University, and after walking around, they finally walked towards a hot pot restaurant. Now in this season, with the temperature of Yanjing at the moment, it is very comfortable for several people to eat hot pot together.

The four masters and apprentices haven't seen each other for more than three months, so they naturally have a lot to say together, but most of the time, Tao Li and Chen Tianxiang are listening, and the other two are talking. Zhang Xingchen is a little better, after all, when he was in school before, he was mostly silent, but Zheng Tongya is different, he is a chatterbox, basically from beginning to end, and has not stopped for a moment.

The four of them started eating at six o'clock and didn't finish the meal until about eight o'clock in the evening, and Tao Li took the opportunity to go to the bathroom to settle the account by the way.

After eating, the four of them came to the campus of Yan University, it was already dark, at this time the various teaching buildings on the campus were brightly lit, and it was rare to see students walking on the road.

"Okay, Teacher Chen and I will send you here, do you two go back to the dormitory or go to the classroom for self-study?" After the four of them walked to the front of the teaching building of Yuanpei College, Tao Li stood in front of the stairs and said.

There is still more than an hour of subway to go from here to the hotel where they are staying, and it should be almost ten o'clock when they return to the hotel.

"Then teacher, when will you go back to Jinling? "I stayed for less than five hours in total, and finally met the teacher in Yanjing, Zhang Xingchen was obviously reluctant.

"Yes, yes, I'll send a teacher to Brother Chen. Zheng Tongya also said hurriedly.

"Our game is on Saturday and Sunday, so if nothing else, it should be back next Monday afternoon, when it is estimated that you are still in class, so I will not use you to send it, and during the winter and summer vacations, remember to go home often to see. Don't bother with it. Chen Tianxiang patted the shoulders of the two people and said.

"Okay, don't stand outside, it's cold, you two hurry in, Teacher Chen and I should hurry back, don't be too savory outside, pay attention to your body, don't study so hard, the teacher still says that, you will always be my pride!" Tao Li stepped forward, sorted out Zhang Xingchen's collar, and said earnestly.

Zhang Xingchen couldn't help it, but when he heard Tao Li's heartwarming words, his eyes turned red all of a sudden.

"Okay, hurry up and get in, you just want me and Teacher Chen to stand outside, Xiaoya, hurry up and pull him in!" Tao Li looked at Zhang Xingchen's unproductive appearance and said angrily.

"Teacher Tao, Teacher Chen, then let's go in first, and you must tell us when you leave, even if you skip class, Xiaoya and I will send you off." Zhang Xingchen rubbed his eyes and said.

Seeing the two of them walking into the teaching building, Tao Li turned around and said to Chen Tianxiang, "Okay, let's go back quickly." ”

"No, you have to wait for me, my stomach suddenly hurts, let me go to the toilet in the teaching building. Chen Tianxiang suddenly covered his stomach and said.

"It's time for your stomach to ache. Tao Li said helplessly.

There is no way, I can't control other people's shit and fart, Tao Li had to walk into the teaching building with Chen Tianxiang, Chen Tianxiang found a toilet nearby and went in, Tao Li was idle and bored, so he walked back and forth in the corridor, and happened to see a classroom with lights on but no one, so he walked in and sat down.

I was going to look at my phone, but I accidentally looked up and saw a question on the blackboard, and I couldn't help but put it back when I just took out my phone, and then I couldn't help but walk to the front of the blackboard, picked up the chalk and prepared to do it.

This problem on the blackboard is actually just a simple electromagnetic physics problem, more precisely, it is a problem that uses Maxwell's equations, and the physics knowledge of the problem itself is not difficult, but the difficulty is that when solving Maxwell's equations, it requires a very deep mathematical knowledge.

Tao Li has nothing to do, plus he hasn't used the knowledge of advanced mathematics for a long time, and he has been exposed to high school mathematics all year round, and if he doesn't use the knowledge of advanced mathematics, he will probably have to return it to the teacher, so he simply took the chalk and began to do it seriously on the blackboard.

I don't know if it's because I've forgotten a lot or because the mathematical knowledge used in this question is already very profound, Tao Li, who was born in the Department of Mathematics, didn't know how to answer for a while.

"If, mathematically, Maxwell's equations are easier to calculate in their differential form than in their integral form, and then they are further simplified, they become vector differentials...... According to Gauss's theorem and Stokes's theorem, the current system of equations can be further simplified into such a form!"

Tao Li tried to recall the previous knowledge, while writing on the blackboard, but after less than five minutes, the original blank blackboard had been written by Tao Li nearly half of the problem-solving process, and at this time, there was still no clue from the final result.

Tao Li's spirit of studying difficult problems in school was immediately hooked by this question, and as a double degree in mathematics and physics, he couldn't be stumped by this question!

Thinking of this, Tao Li's competitive spirit suddenly came up, and the chalk in his hand was writing faster and faster.