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Slava's Monoid Zoo

https://factorcode.org/slava/monoids.html
28•luu•1d ago

Comments

voidUpdate•1h ago
> "Can you see a way to transform a string of 8 apples "" into a string of 10 apples ""?"

Am I missing something? The only rules we have are BAB -> AAA and BBB -> BB, and we start with only A, no B, so neither of those rules can be used, so the answer is no?

EDIT: Ah, looks like you cant put emoji in HN comments. Imagine there's apples in there

Phemist•1h ago
The relations are bi-directional. So you can change AAA -> BAB and BB -> BBB as well.
voidUpdate•1h ago
Oh, I see. That makes sense
dhosek•2m ago
Yeah, that was the secret sauce that left me a bit confused
entaloneralie•48m ago
Too scared to leave the comfy world of commutative monoids.

Laws of Software Engineering

https://lawsofsoftwareengineering.com
401•milanm081•4h ago•198 comments

As Oceans Warm, Great White Sharks Are Overheating

https://e360.yale.edu/digest/great-white-sharks-climate
48•speckx•56m ago•21 comments

Your favorite brands got worse on purpose

https://www.worseonpurpose.com/p/your-favorite-brands-got-worse-on-purpose
53•neon_electro•1h ago•11 comments

Tim Cook's Impeccable Timing

https://stratechery.com/2026/tim-cooks-impeccable-timing/
121•hasheddan•4h ago•167 comments

Show HN: VidStudio, a browser based video editor that doesn't upload your files

https://vidstudio.app/video-editor
142•kolx•3h ago•55 comments

John Ternus to become Apple CEO

https://www.apple.com/newsroom/2026/04/tim-cook-to-become-apple-executive-chairman-john-ternus-to...
2079•schappim•19h ago•1178 comments

Fusion Power Plant Simulator

https://www.fusionenergybase.com/fusion-power-plant-simulator
30•sam•1h ago•10 comments

Show HN: GoModel – an open-source AI gateway in Go; 44x lighter than LiteLLM

https://github.com/ENTERPILOT/GOModel/
30•santiago-pl•1h ago•8 comments

A type-safe, realtime collaborative Graph Database in a CRDT

https://codemix.com/graph
89•phpnode•5h ago•28 comments

Running a Minecraft Server and More on a 1960s Univac Computer

https://farlow.dev/2026/04/17/running-a-minecraft-server-and-more-on-a-1960s-univac-computer
81•brilee•3d ago•14 comments

Original GrapheneOS responses to WIRED fact checker

https://discuss.grapheneos.org/d/34369-original-grapheneos-responses-to-wired-fact-checker
12•ChrisArchitect•40m ago•3 comments

Tindie store under "scheduled maintenance" for days

https://www.tindie.com/
59•somemisopaste•2h ago•16 comments

MNT Reform is an open hardware laptop, designed and assembled in Germany

http://mnt.stanleylieber.com/reform/
171•speckx•1d ago•68 comments

Anthropic says OpenClaw-style Claude CLI usage is allowed again

https://docs.openclaw.ai/providers/anthropic
357•jmsflknr•12h ago•210 comments

Anthropic takes $5B from Amazon and pledges $100B in cloud spending in return

https://techcrunch.com/2026/04/20/anthropic-takes-5b-from-amazon-and-pledges-100b-in-cloud-spendi...
105•Brajeshwar•2h ago•104 comments

Slava's Monoid Zoo

https://factorcode.org/slava/monoids.html
28•luu•1d ago•5 comments

Clojure: Transducers

https://clojure.org/reference/transducers
5•tosh•2d ago•0 comments

Leonardo, Borgia, and Machiavelli: A Fateful Collusion

https://www.historytoday.com/archive/leonardo-borgia-and-machiavelli-fateful-collusion
9•apollinaire•5d ago•0 comments

Salmon exposed to cocaine and its main byproduct roam more widely

https://www.science.org/content/article/cocaine-pollution-gives-salmon-wanderlust
98•1659447091•10h ago•56 comments

The Beauty of Bonsai Styles

https://longwoodgardens.org/blog/2023-05-17/beauty-bonsai-styles
152•lagniappe•11h ago•27 comments

A Roblox cheat and one AI tool brought down Vercel's platform

https://webmatrices.com/post/how-a-roblox-cheat-and-one-ai-tool-brought-down-vercel-s-entire-plat...
252•bishwasbh•11h ago•139 comments

Apple ignores DMA interoperability requests and contradicts own documentation

https://fsfe.org/news/2026/news-20260420-01.html
160•kirschner•4h ago•28 comments

Louis Zocchi, games industry pioneer, has died

https://icv2.com/articles/news/view/62176/r-i-p-louis-zocchi-the-godfather-dice
102•sgbeal•9h ago•48 comments

High-Fidelity KV Cache Summarization Using Entropy and Low-Rank Reconstruction

https://jchandra.com/posts/hae-ols/
44•jchandra•2d ago•7 comments

Qwen3.6-Max-Preview: Smarter, Sharper, Still Evolving

https://qwen.ai/blog?id=qwen3.6-max-preview
669•mfiguiere•1d ago•359 comments

How to make a fast dynamic language interpreter

https://zef-lang.dev/implementation
223•pizlonator•14h ago•41 comments

The purist's guide to phở in Hanoi

https://connla.substack.com/p/pho-in-hanoi-a-purists-guide
73•vinhnx•2d ago•28 comments

Less human AI agents, please

https://nial.se/blog/less-human-ai-agents-please/
65•nialse•8h ago•95 comments

Vera C. Rubin Observatory has Discovered 11,000 New Asteroids

https://www.universetoday.com/articles/the-vera-c-rubin-observatory-has-discovered-11000-new-aste...
36•tcp_handshaker•2h ago•4 comments

Kimi vendor verifier – verify accuracy of inference providers

https://www.kimi.com/blog/kimi-vendor-verifier
295•Alifatisk•21h ago•27 comments