The love of functions and derivatives

"Do you have any enemies?" Derivative sat on the sofa and asked.

Function is sitting right in front of him.

All mathematical definitions that can be named by name exist in the form of individual figures in the world of high school mathematics textbooks.Even some mathematical concepts may have intersections, such as maps and functions.Therefore, in the high school mathematics field, except for the few question types and test sites that are most concerned about in the college entrance examination papers, many remaining mathematical concepts are basically impossible to become college entrance examination questions, and they are in a state of being unemployed.If the vagrant evolves a little further, he becomes a gangster.

Mapping, for example, has never received care for the college entrance examination.

"No." Function shook his head.

"Anyway, be careful." Derivative added solemnly, "Why don't you save my mobile phone number, if you don't mind, it's best to set a shortcut key to dial, so that even in case of special circumstances, it is convenient to call for help."

"I have your number in my phone."

"Given to you by the person who proposed the college entrance examination?" Derivative asked.

"Ah."

When the test taker gives the QQ number to the function, of course he will not forget to give the mobile phone number.The function is saved.

"Okay. Then you must pay attention to safety." The derivative stood up from the sofa and said to the function, "Then I will go back."

"You—" Function blurted out, and he also hurriedly stood up and reorganized his words, "I don't know who the other party is targeting, what if the target is you, what should I do if I happen to meet him when I go out now?"

The function focused its short attention on the derivative: "Why don't you stay with me for one night today?"

"Are you worried about me?" Derivative chuckled slightly, the corners of his eyes slightly curved, and the warm yellow lights reflected in his pupils, "Don't you know who the other party's target is? If I go out and fight with gangsters, then It's targeting me. If I get home safe and sound, it's not me."

"You—" Function frowned and wanted to say something, but was interrupted by the words of derivative——

"I'm just kidding." The corner of the derivative's slightly raised mouth still maintained the previous arc, "Don't worry, I have learned boxing, Taekwondo tenth level."

Derivative grasped the doorknob with four fingers, turned his head and said to the function, "Goodbye."