one-among-us-data/people/Kotori/page.en.md

---
name: Kotori
info:
    alias: Kotori, Truth-Seeking Salted Fish, Partial Differential 
    # Cheng Peiqi
    location: Hefei, Anhui
    # Shangrao, Jiangxi
---

> All things contain mathematical structures.
>
> By Kotori

## Description

Kotori was a girl who was fond of mathematics and physics, she entered the Department of Physics, School of Physical Science, University of Science and Technology of China (USTC) in the fall of 2017.

She also operated another account under the alias "Partial Differential",
using an avatar depicting the character `∂`,
which was a stylized cursive `d` mainly used as a mathematical symbol, usually to denote a partial derivative such as `∂z/∂x`.

Kotori was an introverted girl.
She seldom talked with others or expressed her points of view in public.
However, she was passionate about academic questions,
and she always joined in the discussion and applauded her friends for their neat ideas.

She often deleted her own ideas or works after creating them, or she posted them anonymously.
Nonetheless, there are still some answers of her remained on Zhihu now, rediating her brilliance.

She was obsessed with her favourite subjects, and achieved that "erudite and Atsushi, cut near the question thinking."

Kotori had another well-known nickname, Truth-seeking Salted Fish.
But in terms of her ability, she was truly a truth-seeking whale in the ocean. 

She was so good at mathematics and physics that she could also be considered as a talented girl.
Maybe she would make great contributions in the field of theoretical physics in the future...

But fate always interferes with geniuses.

## Departure

Kotori suffered from depression and gender dysphoria,
and her mental health was not so good.
She had attempted to take her own life before but was rescued.

After consulting numerous references to ascertain the lethal dose of the drug,
she ultimately decided to end her life on the morning of September 24th, 2019.

After that, her friends endeavoured to contact with USTC authorities, and police in Poyang, Shangrao.
However, due to the lack of of timely treatment, she was unable to recover and left us at last.

## Memorial

In Zhihu question [What are your thoughts about ZhiHu user @Cheng Peiqi](https://www.zhihu.com/question/347747351) and her obituary, many friends of Kotori expressed their sadness and regret of the death of her.

Sakura Moeka wrote:

> In the Zhihu question of thoughts about me, Kotori replied that I was lovely, and she wanted to see my wedding day.
>
> But she would never see that.

Her friends perpetually felt a deep longing for her persence.
Even the mere sight of the character `∂` evoked profound sorrow within them.

Countless companionships, and stories of getting to know each other had finally become fragments of the past...

> Goodbye, world.
>
> No, never say goodbye.
>
> By Kotori 2019-09-24

Goodbye, Kotori, but we will never say goodbye.

*May your memory be eternal.*

Contributors for this entry: One-Among-Us, [Hanlianyi](http://twitter.com/HANLIANYI520), [Kristall Wang](https://github.com/KristallWang)