The love of functions and derivatives

"Squeak—" the door was closed, the function was a little dazed, and the derivative's smile lingered like the moisture of the rainy season.

Will there be any danger on his way?

What if the other party has help?

What if the other party has a knife?

The existence of a mathematical definition is eternal life. If you want to destroy a mathematical definition, you must fundamentally prove that it is wrong, otherwise, they will not die no matter how many injuries they receive.It's just that their sensitivity to pain is the same as that of humans, and the time it takes for their bodies to repair is also the same as humans.

In other words, if the derivative is attacked and outnumbered, he can actually feel the pain of dying, even if he won't really die.

But these are only known by the function later, and the current function is still worried about the life safety of the derivative.

The mathematical definition in the textbook is essentially a pool of ink, so they are different from human beings in that the blood of the mathematical definition is black.

Function felt that he should be more firm, and he should keep the derivative anyway, and he shouldn't be allowed to take this risk.

This point function should have been surfing the Internet, but when I clicked on Weibo, I found that today's melons are particularly boring and unpalatable.

Function uninterestedly closed Weibo.

A sentence suddenly popped up in my mind: Is the derivative at home?

The function expressed regret that I should have sent a text message to report safety when the derivative arrived home, but it is too late to say this now.

How about a phone call?

Function sits at the desk and glances at the clock. Half an hour has passed, but Function doesn't know how far the derivative's home is from a residential area. So, is half an hour enough for him to get home?Is it too early?

The function clicks on the contact and finds the number of the derivative. When the fingertip is only 0.5 cm away from the number, the function withdraws its hand.

Forget it, just wait.

Five minutes later, when the fingertip was only 5 cm away from the number, the function withdrew his hand again.

Or wait a little longer.

But the only difference this time is that just as Function moved his hand away, the phone sounded——

#You received a text message from the derivative#

The function clicks on the text message immediately.

"The road is going well, I'm home, good night, go to bed early."

Function looked at the words on the screen and blinked. Also, how could a tenth-level Taekwondo Sanda player be inferior to street gangsters?

Maybe he didn't even realize that Function himself, the corner of his mouth was involuntarily smiling, and then he realized belatedly——

Ah, it turns out that the derivative can be a joke.