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`

Bulhwi Cha @chabulhwi@mathstodon.xyz

12/8/2025, 10:39:17 AM

Public

At last, I finished reading Chapter 7 of "Theorem Proving in Lean 4" in Korean by explaining how to use three tactics: cases, induction, and injection. https://youtu.be/N-ELdwO-vN4?si=kfemVPbbNP-Gf0m8

"린 4로 하는 정리 증명" 7장 (11) 귀납형에 대한 전략

• "린 4로 하는 정리 증명" 7장: https://lean-lang.org/theorem_proving_in_lean4/Inductive-Types• 7장 퀴즈: https://git.sr.ht/~chabulhwi/tpil-solutions/tree/master/item/doc...

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