The elderly man who helped open the door looked to be about seventy years old, with silver hair and good spirits. "I'm so sorry to wake you up early in the morning!" Tang Jianyu said flatteringly, the old man brushed down his hair, "I'm happy, I woke up early when I got old." He heard that Tang Jianyu lived in the hotel yesterday, and the boss on his face was unhappy, "Do you dislike that grandpa is old and doesn't care about the house, so he runs outside to sleep without saying a word?" Tang Jianyu rarely showed a coaxing expression of the child, pinched the old man's thin shoulders and said, "It was too late yesterday, I don't want you to be tired!" While the two were talking, Shi Jiaojiao walked over from the emergency passage after going to the toilet and bowed to the old man, "Hello grandpa." ”

"Hello, okay, let's go in first!" Grandpa opened the door and let Shi Jiaojiao into the house first. This is a very well-laid out single apartment, because it has been uninhabited for a long time, the interior furnishings are very simple, but it is very clean at regular intervals. "This is still bought by Ah Yu when he was in college, and no one else has lived in it, and it has been almost twenty years." This sounds different from what Tang Jianyu said, Shi Jiaojiao used her eyes to verify, and Tang Jianyu pretended to be dead and didn't open his face. "Grandpa Gu, the facilities here are regularly overhauled, so you can move in immediately, right?" Tang Jianyu turned around and asked, the old man kept looking at Shi Jiaojiao, and said perfunctory to Tang Jianyu, "Yes, yes." ”

When Shi Jiaojiao ran to the balcony, Grandpa Gu asked Tang Jianyu mysteriously, "You tell me honestly, is this girl really an ordinary tenant?" Tang Jianyu nodded, "It's not ordinary, I've known each other for a long time." "Then she ......" The old man was just about to ask the point, Shi Jiaojiao ran back with a happy face, Tang Jianyu quickly put his index finger on his lips and winked at Grandpa Gu.

"It's amazing here! There is a row of tall cherry trees growing outside, and it must be beautiful when they bloom! Shi Jiaojiao sighed, and Grandpa Gu looked at the girl Shi Jiaojiao happily when he heard it, and said, "Have a vision, those trees are all older than you!" Unable to find any reason to refuse, Shi Jiaojiao decided to move over in the afternoon.

Grandpa Gu handed over the key and access control cartoon before leaving, "I said to help, but he had to let me." Don't be afraid, the property is nice and safe. I live in the opposite community, and it's easy to make a phone call if you have something! Because Tang Jianyu said that he would explain the rent and other expenses, Shi Jiaojiao didn't say much, and said goodbye to the old man obediently. When the old man walked away, Shi Jiaojiao asked, "Is this your own grandfather?" ”

Tang Jianyu knocked Shi Jiaojiao on the back of the head, "Didn't you hear me call him Grandpa Gu!" He was a servant of my maternal grandfather, and he grew up in my maternal grandfather's house, but later when the house was raided during the civil turmoil, he was also separated from my grandfather. Shi Jiaojiao secretly thought that Tang Jianyu was still a "descendant of the landlord", but she asked: "What happened later?" The two of them walked down the stairs to the place where they had parked, "and then he came back, but there was no such thing as a servant in the new society." However, after the family property was returned, my grandfather's family was in a good situation, and Grandpa Gu stayed at home to help, and my mother's generation recognized him as their uncle. ”

Walking to the car, the two were not busy getting into the car, Shi Jiaojiao's mouth was circled in an "oh" shape, and her head was still sorting out the story of Grandpa Gu. Tang Jianyu raised his head, saw the slightly reddish cone-shaped leaves on the big tree beside the road, and asked, "How do you recognize this as a cherry tree?" Shi Jiaojiao also looked over when she heard this, this tree was taller and stronger than she imagined, and the dense branches didn't seem to even blow through the morning breeze. Because there are many of these trees in the town middle school, although they are small, they are already beautiful when they bloom! Tang Jianyu thought about it for a moment and asked noncommittally: "Why don't I remember." "You just remember the math formulas."

Tang Jianyu didn't care, looked at his watch and opened the car door, "I'll send you back to pack your things, and I'll go over to help with things in the afternoon." I have other things to do in the morning. When Shi Jiaojiao heard this, she hurriedly said: "You go directly to the errand, I'll just do the bus!" Tang Jianyu rolled his eyes, "I want to recognize the way once." Shi Jiaojiao pursed her lips in admitting defeat, and as soon as she sat in the seat, the other foot did not come in, and something rolled out of the car along her legs.

When Shi Jiaojiao really sat down, Tang Jianyu looked at her looking down and concentrating on research, and asked curiously, "What is it?" Shi Jiaojiao's shoulders collapsed and shook the object in her hand, "The back cover of the mobile phone is off!" Tang Jianyu fixed his eyes and saw that it was still the green-screen mobile phone that Daddy Shi eliminated for her! Shi Jiaojiao also saw Tang Jianyu's hidden surprise, shrugged her shoulders and laughed at herself: "It's a little old, but it's very easy to use." If it hadn't been broken last time when I fell to the ground, there really wouldn't have been a problem at all! Tang Jianyu didn't say a word, and Shi Jiaojiao shouted in her heart: "Okay, I'm already planning to save money to change my mobile phone first, smart phone!" Tang Jianyu still didn't speak.

"If you forget how to drive in, call me and I'll move things to the gate of the community!" Shi Jiaojiao leaned on the car window and said that she was worried that Tang Jianyu would get lost after turning around after entering the community. "What about when I were you?" Tang Jianyu cocked the corners of his mouth and teased, Shi Jiaojiao knocked down the edge of the window, and her willow eyebrows were upside down: "You are really!" As he spoke, he took a step back and waved his hand extremely perfunctorily, "It's good to go, don't send it." "Call you before you come." Tang Jianyu smiled, Shi Jiaojiao only moved her mouth, "Oh." ”

Tang Jianyu was going to the top floor of the tallest building in the city to make an appointment, and as soon as he walked into the revolving door, he saw the invitees, and when he looked at the watch, the time was just right, and they were all absolutely punctual people. "To the top floor, please take the VIP elevator." Under the leadership of the reception, the two went to an unmanned elevator next to the hall and went all the way up. Zhang Kun copied it in his pocket with one hand, looked at his watch with the other, and said, "I'm sorry for calling you to talk at such an embarrassing time." Tang Jianyu replied with a smile, "As a junior brother, I should have talked more about my senior brother." ”

As soon as the elevator opened, I saw a porch decorated with black wood carvings, and the elegant etiquette greeted Zhang Kun as soon as he saw it, "Secretary Bai has booked a seat for you." Zhang Kun bowed slightly, and Tang Jianyu followed the waiter to the seat one after the other, and the female tea artist who cooked the tea was already sitting in front of the silk "Bamboo Drawing" and waiting. The tea temperature is slightly lower. Zhang Kun followed the *, and then sat face to face with Tang Jianyu on the bamboo woven table and chair.

"How's yesterday's report?" Zhang Kun opened with this, and Tang Jianyu recalled the content of the report and replied: "Well, how to say it, I feel a little off-topic. Originally, it was about the breakthrough of topology and high-dimensional geometry, but in the end, I completely broke away from algebraic topology and leaned towards economics, which I was a little disappointed in. The domestic sector is slightly inferior to the outside in terms of academic atmosphere and development prospects. Zhang Kun seemed expressionless, but in fact, countless proofs and conjectures had flown through his mind quickly.

Seeing that the situation was unclear, Tang Jianyu hurriedly spread his hands and relieved himself: "I unconsciously said too much, senior brother, don't be surprised." Zhang Kun raised his eyes to look at Tang Jianyu, and only said two words lightly, "It's okay", just as the two looked at each other without saying a word, the female tea artist in a plain antique dress had already scalded the cup for the two of them and served the first tea. Zhang Kun tested the temperature of the cup wall with the back of his hand, then pushed the tea aside, and didn't smell it, while Tang Jianyu took a sip and nodded gently at the tea man.

"In China, how many third-rate economists claim to be half mathematicians, and if they have money, they have scientific research results." Zhang Kun looked at the sword-shaped bamboo leaves interspersed on the "Bamboo Drawing" behind the tea table, which was quite Escher's style. Tang Jianyu did not comment on this pessimistic attitude, and only responded with a "um". Both of them are not good at words, and the scene is so cold that the tea cooks feel a little embarrassed, and they feel even more apprehensive about ordering tea next.

"In fact," Zhang Kun gently tapped the heavy table with the knuckles of his fist, and said, "I know that Du Lao had a second stroke and can't go home if he is in a special ward." He was so kind to me that I couldn't help but worry about his old man, but he insisted on not seeing me. Tang Jianyu's surprised look was fleeting, and he asked, "What role can I play?" Zhang Kun had more affection for this straightforward junior brother, couldn't help but smile, and said: "Actually, it's nothing, I just want to talk to you and listen to you talk about his recent situation, after all, you are also his favorite student." ”

Through the cold appearance and beyond the care for the former teacher, Tang Jianyu saw that Zhang Kun's heart has never extinguished the flame of mathematics. "Du Lao has been very good this year, although he can't move around flexibly, but there is absolutely no problem standing independently. It's still so strict, you can come up with exam questions casually, and if you can't answer, you'll be beaten with a stick! Tang Jianyu described it vividly, and Zhang Kun finally laughed out loud, "Haha, that's good." ”

The tea artist who served the three courses of tea began to change the tea set, Zhang Kun asked Tang Jianyu if he was used to drinking tea, Tang Jianyu shook his head. Zhang Kun immediately stopped the man, "Let's make another new tea." The waiter bowed slightly. Zhang Kun was much more relaxed than before, and his tone was rarely softer, "Old Du must still be angry with me." Seeing Tang Jianyu's puzzled eyes, he continued: "About a time when I went to France with you, he found me and asked me to guarantee his study abroad for a graduate student, but I refused. ”

Tang Jianyu frowned, "This is normal, I can't be angry with you, right?" Zhang Kun pursed his lips, "You know, let alone being a guarantee agency, even if the costs are borne by me, it's really nothing to me." Tang Jianyu's expression was even more confused, and Zhang Kun explained: "Old Du is old, and he is really a little confused!" He may be too talented, and he is blinded and does not know it. "How?" Zhang Kun's face darkened, "I checked, this person's brain is okay, his family background is really difficult, and his father died early." ”

"Originally, the road to study was smooth and smooth. Who knew that when he was a graduate student, his true nature was revealed: on the one hand, he flattered Du Lao and obtained a special allowance; On the one hand, he forced his old mother, who was over fifty years old, to remarry a dying old man, and under the banner of hard study! What's wrong with scientific research, to carry this kind of black cauldron that has lost all conscience? Zhang Kun's tone was extremely cold, Tang Jianyu licked his lips and said, "Can't you directly reflect with Du Lao?" "I want him to listen too...... On the other hand, our city is very good, and I am no longer a person who studies mathematics......"

The room brightened a little with the change of the position of the sun, and as the two were talking, the waiter in a blue cheongsam knocked on the edge of the door through the screen and asked gently, "Do you need to arrange lunch?" The two of them looked at their watches and found that it was almost twelve o'clock. Zhang Kun looked at Tang Jianyu, "It's rare to see each other once, do you have lunch together?" I also do my landlord's friendship. Tang Jianyu remembered to move Shi Jiaojiao, there must be a lot of trivial matters after that, and he had to rush back to City A at night, and it would be good to have more time, so he politely declined the invitation of his senior brother, and Zhang Kun would not say anything to stay.