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mathlib3
Lean2019–2023
leanprover-community / mathlib3 · Archived

mathlib3

Lean 3's obsolete mathematical components library: please use mathlib4

15Distinct people
19Mentions
0Explicit recommenders
1.7KGitHub stars
REPOSITORY AT A GLANCE

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What it is

Lean 3's obsolete mathematical components library: please use mathlib4

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

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This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 12:54:37 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year19 dated mentions

Observed mentions: 2019-09-30 06:45:15 UTC to 2023-12-09 19:32:54 UTC.

024682019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments20192020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 3 mentions; 0 submissions, 3 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 4 mentions; 0 submissions, 4 comments20212022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 3 mentions; 0 submissions, 3 comments2023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 8 mentions; 0 submissions, 8 comments2023

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC101
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC303
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC404
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC303
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC808

What Hacker News says

19 sources
Communication skills, Leadership skills, Research skills and newer tools for formal methods and theorem proving. The example prompts in the "Teaching with AI" OpenAI blog post are paragraphs of solution specification; far longer than the search queries that an average bear would take the time to specify. https://openai.com/blog/teaching-with-ai https://blog.khanacademy.org/khan-academys-7-step-approach-t... Is there yet an approachable "Intro to Arithmetic and beyond with Lean"? What additional resources for learning Lean and Mathlib were discovered or generated but haven't been added to the docs? https://news.ycombinator.com/context?id=38522544 : AlphaZero self-play, LLMs and Lean, "Q: LLM and/or an RL agent trained on mathlib and tests" https://github.com/leanprover-community/mathlib/issues/17919... -> Proof Assistance SE: https://proo
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fassistants.stackexchange.com/ Perhaps to understand LLMs and application, e.g. the Cuttlefish algorithm fills in an erased part of an image; like autocomplete; so, can autocomplete and guess and check (and mutate and crossover; EA methods and selection, too) test [math] symbolic expression trees against existing labeled observations that satisfy inclusion criteria, all day and night in search of a unified model with greater fitness?
In 'A-team' of math proves a critical link between addition and sets
Quantum Discord: https://en.wikipedia.org/wiki/Quantum_discord Quantum nonlocality: https://en.wikipedia.org/wiki/Quantum_nonlocality Butterfly effect -> Quantum chaos: https://en.wikipedia.org/wiki/Quantum_chaos -> Perturbation theory: https://en.wikipedia.org/wiki/Perturbation_theory_(quantum_m... But then entropy in fluids, Satisfiability > Model Theory: https://en.wikipedia.org/wiki/Satisfiability Goal programming: https://en.wikipedia.org/wiki/Goal_programming And, ultimately, Self play (AlphaZero, ) https://en.wikipedia.org/wiki/Self-play "Q: LLM and/or an RL agent trained on [Lean mathlib] and tests" https://github.com/leanprover-community/mathlib/issues/17919
In An easy-sounding problem yields numbers too big for our universe
For the math that you mention, I would suggest looking at mathlib (https://github.com/leanprover-community/mathlib). I agree that the foundations of Coq are somewhat distanced from the foundations most mathematicians are trained in. Lean/mathlib might be a bit more familiar, not sure. That said, I don't see any obstacles to developing classical real analysis or linear algebra in Coq, once you've gotten used to writing proofs in it. I'm curious, which field of math do you work in? Edit: for example, that symmetric matrices have real eigenvalues is shown here in mathlib: https://leanprover-community.github.io/mathlib_docs/analysis...
In Will Computers Redefine the Roots of Math?
Lean mathlib was originally a type checker proof assistant, but now leanprover-community is implementing like all math as proofs in Lean in the mathlib project. Lean (proof assistant) https://en.wikipedia.org/wiki/Lean_(proof_assistant) "Lean mathlib overview": https://leanprover-community.github.io/mathlib-overview.html "Where to start learning Lean": https://github.com/leanprover-community/mathlib/wiki/Where-t... leanprover-community/mathlib: https://github.com/leanprover-community/mathlib
In Ask HN: Did studying proof based math topics make you a better programmer?
Take a look at the Natural Number Game! [1] It does exactly that: "Rapid feedback, error messages, maybe even linters and highlighting for the "mathematical syntax"." After you get the hang of the system, you can play with the interactive theorem prover behind it: Lean [2]. There's also plenty other interactive theorem provers (Coq, Isabelle, HOL, Mizar, Metamath, ...) but Lean has a lot of traction amongst mathematicians at the moment. There are no limits to the math you an do with this. There is mathlib [3], the main mathematical library. It covers a lot of undergraduate material [4], and plenty of stuff beyond that [5]. The community has even covered some state of the art research math in Lean [6a, 6b]. You are very welcome to hang out on the leanprover zulip [7]] and ask questions about the Natural Number Game or anything else that is
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In The Mathematical Hacker (2012)
AutoML is RL? The entire exercise of publishing and peer review is an exercise in cybernetics? https://en.wikipedia.org/wiki/Probabilistic_logic_network : > The basic goal of PLN is to provide reasonably accurate probabilistic inference in a way that is compatible with both term logic and predicate logic, and scales up to operate in real time on large dynamic knowledge bases. > The goal underlying the theoretical development of PLN has been the creation of practical software systems carrying out complex, useful inferences based on uncertain knowledge and drawing uncertain conclusions. PLN has been designed to allow basic probabilistic inference to interact with other kinds of inference such as intensional inference, fuzzy inference, and higher-order inference using quantifiers, variables, and combinators, and be a more convenient approach
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than Bayesian networks (or other conventional approaches) for the purpose of interfacing basic probabilistic inference with these other sorts of inference. In addition, the inference rules are formulated in such a way as to avoid the paradoxes of Dempster–Shafer theory. Has anybody already taught / reinforced an OpenCog [PLN, MOSES] AtomSpace hypergraph agent to do Linked Data prep and also convex optimization with AutoML and better than grid search so gradients? Perhaps teaching users to bias analyses with e.g. Yellowbrick and the sklearn APIs would be a good curriculum traversal? opening/baselines "Logging and vizualizing learning curves and other training metrics" https://github.com/openai/baselines#logging-and-vizualizing-... https://en.wikipedia.org/wiki/AlphaZero There's probably an awesome-automl by now? Again, the sklearn interfaces. TIL that SymPy supports NumPy, PyTorch, and TensorFlow [Quantum; TFQ?]; and with a Computer Algebra System something for mutating the AST may not be necessary for symbolic expression trees without human-readable comments or symbol names? Lean mathlib: https://github.com/leanprover-community/mathlib , and then reasoning about concurrent / distributed systems (with side channels in actual physical component space) with e.g. TLA+. There are new UUID formats that are timestamp-sortable; for when blockchain cryptographic hashes aren't enough entropy. "New UUID Formats – IETF Draft" https://news.ycombinator.com/item?id=28088213 ... You can host online ML algos through SingularityNet, which also does PayPal now for the RL.
In Interpretable Model-Based Hierarchical RL Using Inductive Logic Programming
Hey this is really cool. I want to start doing the same thing. Visual group theory is a really nice book for intuition. Also, the YouTube series "Essence of Group Theory" can help in this same line. What I also want to do while self learning is formalizing some theorems and definitions in Lean. Even just looking at how they're already defined in mathlib [1] can be of great help when internalizing the concepts. https://github.com/leanprover-community/mathlib/blob/292e3fa...
In Galois Groups and the Symmetries of Polynomials

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