tlaplus
quint
Our great sponsors
tlaplus | quint | |
---|---|---|
38 | 6 | |
2,208 | 584 | |
1.5% | 5.5% | |
9.1 | 9.8 | |
4 days ago | 4 days ago | |
Java | TypeScript | |
MIT License | Apache License 2.0 |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
tlaplus
- Ask HN: Usefulness of formal verification (Coq) and formal verification (TLA+)?
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Quint: A specification language based on the temporal logic of actions (TLA)
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https://github.com/tlaplus/tlaplus/blob/master/tlatools/org....
In any case, our whole team thinks TLA is great, and we're happy people like you and Ron find it so useful and insightful. We also think it is a very insightful.
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Concurrent Data-structure Design Walk-Through
There are no tests! There are various ways to test concurrent data structures. You could use a stress test, where you spawn a lot of threads and let them mutate the map in a random way and then check the consistency of the map and some invariants. You could learn TLA+ and write a formal model of the map and then verify it.
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In Which I Claim Rich Hickey Is Wrong
Dafny and Whiley are two examples with explicit verification support. Idris and other dependently typed languages should all be rich enough to express the required predicate but might not necessarily be able to accept a reasonable implementation as proof. Isabelle, Lean, Coq, and other theorem provers definitely can express the capability but aren't going to churn out much in the way of executable programs; they're more useful to guide an implementation in a more practical functional language but then the proof is separated from the implementation, and you could also use tools like TLA+.
https://dafny.org/
https://whiley.org/
https://www.idris-lang.org/
https://isabelle.in.tum.de/
https://leanprover.github.io/
https://coq.inria.fr/
http://lamport.azurewebsites.net/tla/tla.html
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Programming Languages Going Above and Beyond
I wish something like Lamport's TLA+ (https://lamport.azurewebsites.net/tla/tla.html) was supported in modern language compilers - perhaps with annotations/macros and a mini formal DSL.
- Ask HN: How you understand TLA+ and how you use TLA+ in your projects?
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A collection of lock-free data structures written in standard C++11
Checking the invariant with assert is also useful in my limited experience with concurrency.
https://lamport.azurewebsites.net/tla/tla.html
- Ask HN: Is writing a math proof like programming without ever running your code?
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What I've Learned About Formal Methods in Half a Year
One advantage of formal methods is in determining "what was expected" (including all the goofy edge cases) without having to burrow into the details of code.
Take a look at Alloy (http://alloytools.org/) and TLA+ (https://lamport.azurewebsites.net/tla/tla.html) for example. (Or even the ancient Z ("Zed") notation (https://www.cs.cmu.edu/~15819/zedbook.pdf)).
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How do I get the set of process identifier of PlusCal?
The pcal generator does *not* generate a definition for the set of labels. However, some users have suggested to add such a feature: https://github.com/tlaplus/tlaplus/issues/613
quint
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Holiday protocols: secret Santa with Quint
Hi! I wrote a blogpost exploring a formal specification in Quint [1] for the secret santa game, and verifying some of its properties with Apalache [2].
Hope you enjoy it, and any feedback is welcome. Happy holidays!
[1]: https://github.com/informalsystems/quint
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Quint: A specification language based on the temporal logic of actions (TLA)
I can sympathize! We are aiming to maintain most of the expressive power of TLA+ -- ideally everything you need for a concise, high-high level specification, that can be simulated and/or verified -- but with surface syntax that is more approachable coming from a programming background. If you're interested in seeing how it maps to TLA+, you can find much of that in this document: https://github.com/informalsystems/quint/blob/main/doc/lang....
We still have lots of ways to improve, and -- we think -- lots of opportunities to improve our interop and complementary qualities in relation to TLA+ and TLC. But we have found the tools in their current state useful enough to be worth sharing :)
- Quint – a new language based on TLA+ with modern syntax and developer tooling
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Programming Languages Going Above and Beyond
It's still in pretty early development, but you may be interested in https://github.com/informalsystems/quint
> It combines the robust theoretical basis of the Temporal Logic of Actions (TLA) with state-of-the-art static analysis and development tooling.
And it is typed ;)
What are some alternatives?
dafny - Dafny is a verification-aware programming language
evm-dafny - An EVM interpreter in Dafny
coq - Coq is a formal proof management system. It provides a formal language to write mathematical definitions, executable algorithms and theorems together with an environment for semi-interactive development of machine-checked proofs.
TypeScript - TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
apalache - APALACHE: symbolic model checker for TLA+ and Quint
stateright - A model checker for implementing distributed systems.
awesome-programming-languages - The list of an awesome programming languages that you might be interested in
adventofcode - Advent of Code solutions of 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 and 2023 in Scala
Corinna - Corinna - Bring Modern OO to the Core of Perl
daisy-nfsd - DaisyNFS is an NFS server verified using Dafny and Perennial.
advent-of-tla - AoC goals in TLA+
adventofcode - :christmas_tree: Advent of Code (2015-2023) in C#