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`

Hacker News 100 @hn100@social.lansky.name

12/2/2025, 11:05:09 AM

Public

Reverse math shows why hard problems are hard

Link: https://www.quantamagazine.org/reverse-mathematics-illuminates-why-hard-problems-are-hard-20251201/
Discussion: https://news.ycombinator.com/item?id=46116724

‘Reverse Mathematics’ Illuminates Why Hard Problems Are Hard | Quanta Magazine

Researchers have used metamathematical techniques to show that certain theorems that look superficially distinct are in fact logically equivalent.

www.quantamagazine.org · Quanta Magazine

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