The love of functions and derivatives

On the other side, Derivative answered the phone and said "Hello" several times like a ghost, but he didn't get a response from the function. He thought it was a bad signal at first, so he hung up the phone and called again——

"Sorry, the number you dialed is temporarily unanswered, please call again later, sorry, the number——"

Derivative pressed the red hang up button a little annoyed.

After redialing three times, the result was the same. Derivative felt inexplicably uneasy. Some bad ideas grew in Derivative’s heart, occupying the whole brain. There is still a lot of work waiting for the function in front of him, and leaving the post without authorization will result in a deduction of salary. , but almost a moment later, the derivative picked up the key and headed towards the parking lot.

The home of the function is not close. Although there is no danger of traffic jams if you ride a bicycle, it takes too long. Derivative made a decisive decision to drive along the path, which bypassed several traffic lights. Although the distance has become longer, But fortunately there was no traffic jam.

There happened to be people in the two elevators in the community building. I don’t know how long it will take. Function’s home is on the fourth floor. Derivative gave up the idea of ​​taking the elevator, and ran up the stairs one step at a time.

While waiting for the door of Runway Function’s house, Derivative found the door open by accident. He was startled, a cold air was born out of thin air and spread to all limbs. An absurd and very appropriate idea, maybe behind this door is hell.

Derivative's hand that pushed open the door was a little trembling.

The door was opened, and the scene inside the door was unobstructed, and the derivative found the person lying in a pool of black blood at a glance——

function.

The derivative fixed his eyes in disbelief.

It is indeed a function.

His throat seemed to be blocked by something, his breathing became so difficult, his heart seemed to be clenched by a pair of big hands, causing a continuous dull pain, and the lack of oxygen caused by the blocked blood made Derivative feel dizzy for a moment.

Derivative forced himself to calm down, and he began to observe the situation around him.