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 50 @hn50@social.lansky.name

2/8/2026, 8:45:06 PM

Public

Formally Verifying PBS Kids with Lean4

Link: https://www.shadaj.me/writing/cyberchase-lean
Discussion: https://news.ycombinator.com/item?id=46857115

Formally Verifying PBS Kids with Lean4

Cyberchase is an educational TV show aimed at children ages 8 - 12 that has been airing on PBS Kids since 2002. As someone who grew up without cable, PBS Kids was the go-to channel after school. From elementary through middle school, Cyberchase became a weekly staple that I enjoyed personally and was approved by my parents for its mathematical content. The show features three kids (Matt, Jackie, and Inez, known as the Cybersquad), who are recruited by a friendly AI (Motherboard) to protect the…

www.shadaj.me

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