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egglog
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Towards a New SymPy
The herbie project using egraphs to explore different ways of rewriting floating point expressions. https://herbie.uwplse.org/ One can also write custom rulesets in egglog (a new egraph rewriting system / language / datalog) https://egraphs-good.github.io/egglog/?example=herbie
The approach is not yet anywhere near being able to touch all the domains sympy can handle. Destructive term rewriting tends to be a bit more forgiving to unsoundness in the rules and still returning roughly meaningful results. EGraph rewriting (and other automated reasoning systems) tend to just return junk as soon as you aren't careful about your semantics. Associativity and commutativity are ubiquitous in CAS applications and encoding these concepts in general purpose terms is rather unsatisfying. The post above emphasizes specialty methods for polynomials, which it would be desirable to find a clean way to integrate into egraph techniques. Variable binding (which is treated in a rather mangled form in CAS systems) is seemingly important for treating summation, differentiation, and integration correctly. The status of doing variable binding efficiently and correctly in egraphs is also unclear imo.
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What is the state of the art for creating domain-specific languages (DSLs) with Rust?
For semantic analyzers, check out egg and egglog. They're custom data structures for representing compiler rewrite rules in a non-destructive way.
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Ask HN: What is new in Algorithms / Data Structures these days?
The recent work on relational, datalog-inspired egraphs in PLDI this year ("Unifying Datalog and Equality Saturation") is actually interesting because it can solve cases like the y/x*x -> y identity example, by the power of an interval analysis on x (among other things.) Sort of like adding a postulate but instead it's by adding relations between terms in the graph.
https://github.com/egraphs-good/egglog
https://arxiv.org/pdf/2304.04332.pdf
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Better Together: Unifying Datalog and Equality Saturation
Close, but the link is on Page 13, and it points here: https://github.com/mwillsey/egg-smol
Unfortunately the naming is all a bit confusing, isn't it....
moros
- Moros: Hobby rust operating system with SSH demo
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Ask HN: What apps have you created for your own use?
More than I can count, but here are the big ones:
http://moros.cc - A hobby operating system, with a shell, an editor, a lisp interpreter, and many other little things
https://geodate.org - A lunisolar calendar with decimal time (centidays and dimidays)
https://github.com/vinc/geodate - An implementation of the calendar + time
https://github.com/vinc/geocal - A tool to visualize the calendar + time
https://github.com/vinc/littlewing - A chess engine written in Rust (and another one before that in C++)
https://vinc.cc/software/ - A more complete list, on my personal website
I'm good at scratching my own itches but less good at finding projects that could be useful for other people.
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Announcing MOROS 0.10.1 - A hobby operating system written in Rust
MOROS is a text-based hobby operating system targeting computers with a x86-64 architecture and a BIOS. It is inspired by Unix and ITS but is closer to a modern DOS at the moment in term of features.
- I made a website for my hobby operating system (MOROS)
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MOROS 0.9.0 released
I wrote this a while ago to answer this question: https://github.com/vinc/moros/blob/trunk/doc/index.md
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MOROS 0.8.0 released
Indeed, it cannot run on most of the latest computers except those that can replace UEFI with coreboot + seabios. See here: https://github.com/vinc/moros/issues/270
- Moros: Obscure Rust Operating System
What are some alternatives?
ezno - A JavaScript compiler and TypeScript checker written in Rust with a focus on static analysis and runtime performance
create-rust-app - Set up a modern rust+react web app by running one command.
libclc - Cache Line Container - C11
DomeOS - 🧲 A toy x86_64 OS
scryer-prolog - A modern Prolog implementation written mostly in Rust.
serenity - The Serenity Operating System 🐞
flix - The Flix Programming Language
nomicon - The Dark Arts of Advanced and Unsafe Rust Programming
yjs - Shared data types for building collaborative software
PropertyWebBuilder - Create a fully featured real estate website on Rails in minutes! ⛺
mpack - MPack - A C encoder/decoder for the MessagePack serialization format / msgpack.org[C]
x86_64 - Library to program x86_64 hardware.