Hackers' Pub

Syntax	Description	Examples
`"` keyword `"`	Finds the string within quotes, including spaces. Case-insensitive. (Escape quotes inside with `\"`)	`"Hackers' Pub"`
`from:` handle	Finds content written by the specified user.	`from:hongminhee` `from:hongminhee@hollo.social`
`lang:` ISO 639-1	Finds content written in the specified language.	`lang:en`
`#` tag	Finds content with the specified tag. Case-insensitive.	`#HackersPub`
condition condition	Finds content that satisfies both conditions on either side of the space (logical AND).	`"Hackers' Pub" lang:en`
condition `OR` condition	Finds content that satisfies at least one of the conditions on either side of the OR operator (logical OR).	`#HackersPub OR "Hackers' Pub" lang:en`
`(` condition `)`	Combines the operators within the parentheses first.	`(#HackersPub OR "Hackers' Pub" OR "Hackers Pub") lang:en`

이하 @evenharder@hackers.pub

1/7/2026, 2:35:23 PM

Public

2026년 1월 7일

Mochalov's Seven 7s라는 충식산(蟲食算) 문제이다.

     ..7..
   * .....
----------
    .7....
    ....7
  77....
  .....
....7.
----------
........7.

이하 @evenharder@hackers.pub

1/8/2026, 12:21:42 PM

Public

2026년 1월 8일

잘 알지 못하는 위상수학의 세계로 들어간다. 숫자 8처럼 생긴 '8자 모양 공간(Figure-8 space)'의 기본군(Fundamental group)은 $\mathbb{Z} \times \mathbb{Z}$ , 즉 두 개의 생성원을 가진 자유군(Free Group)이다.

If you have a fediverse account, you can quote this note from your own instance. Search https://hackers.pub/ap/notes/019b9d8e-3b76-78a9-9dfa-cbd176df454b on your instance and quote it. (Note that quoting is not supported in Mastodon.)