#38 Haskell, Lean, Idris, and the Art of Writing - David Christiansen

Type Theory Forall

#Science #Tech #Pedro Abreu #Type Theory #Academia #Programming Language

30:52

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about a year ago 1:55:58

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In this episode we talk with David Christiansen, he wrote the books Functional Programming in Lean and the Little Typer.

He has also worked as the Executive Director of the Haskell Foundation, at Galois and did his PhD developing a bunch of cool stuff for Idris.

David is a super upbeat person and I feel that we could spend hundreds of hours talking about Functional Programming Writing and Dependent Types, and we still wouldn’t run out of topics!

If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall

91 episodes

#38 Haskell, Lean, Idris, and the Art of Writing - David Christiansen

Type Theory Forall

29 subscribers

published about a year ago

MP3•Episode home

In this episode we talk with David Christiansen, he wrote the books Functional Programming in Lean and the Little Typer.

He has also worked as the Executive Director of the Haskell Foundation, at Galois and did his PhD developing a bunch of cool stuff for Idris.

David is a super upbeat person and I feel that we could spend hundreds of hours talking about Functional Programming Writing and Dependent Types, and we still wouldn’t run out of topics!

If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall

91 episodes

#Science #Tech #Pedro Abreu #Type Theory #Academia #Programming Language

All episodes

Type Theory Forall

1
#52 Why is Haskell so special - Lennart Augustsson 1:30:31

26 days ago1:30:31

1:30:31

Lennart Augustsson has spent the last four decades quietly — and sometimes mischievously — shaping the way we think about code. He co-authored Lazy ML in the early 80s, wrote A Compiler for LML back in 1984, and was behind HBC , the first publicly available Haskell compiler. If you've used Haskell, worked with hardware described in Bluespec , or played around with weird combinator-based toy languages, there's a decent chance you've crossed paths with his ideas — directly or indirectly. He's also won the International Obfuscated C Code Contest — not once, but multiple times — reminding us that playfulness and rigor aren't mutually exclusive. But his work didn't stop in academia or hobby projects. He’s brought functional programming into finance , hardware design , large-scale industry — with stints at Credit Suisse, Facebook, Google, and now Epic Games, where he’s helping design a new functional logic programming language called Verse . Over the course of this conversation, we’ll talk about lazy evaluation, type theory, programmable dungeons, the compromises of real-world programming, and what it means to still be building languages after 40 years in the game. Links Type Theory Forall Merch Store Ko-Fi Discord Server Haskell Interlude Lennart's Wikipedia Page Lennart's Webpage…

Type Theory Forall

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#51 s/Coq/Rocq - Nicolas Tabareau 1:42:05

9 weeks ago1:42:05

1:42:05

In this episode we talk with Nicolas Tabareau, the Head of Gallinette, one of the main teams which develop the Rocq theorem Prover at Inria. The original idea of this interview is to talk about the rebranding from Coq into Rocq, which is very exciting to our community. However, Nicolas has such a prolific research career that I couldn’t miss the opportunity to get him to talk so much more about it. So in this conversation we talk about his early publications in neuroscience, his views on Category Theory applied to Type Theory, Rocq’s rebranding, and the institution around it, MetaRocq and the conceptual boundaries of certifying a theory inside itself. Of course we wouldn’t miss the opportunity to also discuss how Rocq view the growing influence that Lean is gaining in our community. Links Type Theory Forall Store Type Theory Forall Website Nicolas Tabareau Website MetaRocq Github…

Type Theory Forall

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#50 The Expression Problem, Functional Pearls, Program Calculation - Wouter Swierstra 2:06:47

12 weeks ago2:06:47

2:06:47

Wouter Swierstra is a Math Bachelor’s from the University of Utrecht, has done his PhD with Thorsten Altenkirch at the University of Nottingham, did a post-doc at Chalmers, has experience in the industry working on facilitating the design of embedded system using FP and currently is a Professor at the University of Utrecht and co-host of the Haskell Interlude Podcast. In this episode we talk about his trajectory into formal methods and functional programming. We talk about Datatypes a la Carte, the Expression Problem, Functional Pearls, Program Synthesis vs Program Calculation, and much more! 0:00 – Intro & Welcome 0:02:08 – Announcing the Type Theory Forall Merch Store! 1:12 – Early Influences: From Lenses to Logic 4:40 – Discovering Functional Programming in Utrecht 8:15 – On Monads, Papers, and Learning by Teaching 12:20 – What Makes a Paper ‘Beautiful’? 17:50 – PhD in Nottingham: Theory Meets Community 22:00 – Writing ‘Certified Programming with Dependent Types’ 29:10 – Teaching Dependent Types: Challenges and Joys 34:00 – On Agda vs Coq: Philosophies and Use Cases 38:40 – Type-Driven Development in Practice 45:05 – The Power of Elegant Proofs 52:00 – Advice to Aspiring Researchers in Type Theory 1:03:00 – Beating C with Functional Programming 1:20:00 – Formal Verification and Loop Invariants 1:33:28 – Program Calculation vs Program Synthesis 1:39:00 – Formalizing Blockchain 2:01:38 – Final Thoughts Links Wouter Website Haskell Interlude Advanced FP Summer School ttforall twitch ttforall store Discount code for 10% off: typetheory…

Type Theory Forall

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#49 Self-Education in PL - Ryan Brewer 2:23:47

21 weeks ago2:23:47

2:23:47

Ryan Brewer is a college dropout who has an incredible blog about PL, Category Theory and Logic. He better define his goal as making Formal Theory more accessible outside the ivory tower of academia, and easier to put into practice where it matters. He has a couple of very interesting main projects, such as the first Cedille 2 Interpreter, Saber VM, and Arctic. In this episode we will talk about all of his projects. His trajectory becoming self-taught in PL, compilers and Formal Methods, and he shares with us the wealth of resources he used to navigate this sea of knowledge. We also have a brief but heated discussion on the ethics of Science. 0:00 – Intro & Podcast Community 3:40 – How Ryan Started Learning Programming Languages 12:40 – Projects, Category Theory & Early Experiences 18:00 – College Life, Dropping Out & Study Strategies 27:00 – Landing a Developer Job Without a Degree 32:00 – Thoughts on JavaScript, TypeScript & WebAssembly 37:00 – Building Arctic: A Compiler for Blogs 41:00 – Introduction to Gleam & Its Unique Features 48:00 – Functional Programming at Work & Community Impact 59:00 – Diving into Haskell and Category Theory 1:08:30 – Ethical Considerations in Software Licensing 1:20:00 – Reflections on Academia & Learning 1:32:30 – Job Interviews & Practical Programming Tools 1:38:00 – Dan on Academia and Podcasting Philosophy 1:54:00 – Final Reflections & Advice for Self-Learners 2:05:00 – Closing Thoughts, Blog, Open Source 2:19:58 – Outro Links Ryan's Website Saber VM Arctic , which is built on top of Lustre Category Theory Wiki…

Type Theory Forall

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#48 Bell Labs - David MacQueen 2:10:12

28 weeks ago2:10:12

2:10:12

In this episode we continue with our conversation with David MacQueen, he is an Emeritus Professor from the University of Chicago, and has worked at Bell Labs for 20 years. Bell Labs began as the research and development section of the American Telephone and Telegraph company, aka AT&T, which originally hold exclusive hold of the telephone patent. Once that expired in the 1800s they needed to develop new technology to prove that it was still the best company, and hence Bell Labs was born. Over the course of the years this fascinating institution has registered more than 26 thousand patents, among of which we have the transistor, the laser, the solar cell and communication satellites. Over the course of the last 88 years they were awarded a jaw dropping amount of 10 Nobel prizes and 5 Turing awards. In this interview David MacQueen shares with us how was it like to work in such an incredible institution during it’s golden age. He shares insights about the technology, the space, the people, the management style, and much more! Links David's Website David's Github…

Type Theory Forall

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#47 The History of LCF, ML and HOPE - David MacQueen 2:05:04

30 weeks ago2:05:04

2:05:04

David MacQueen has worked at Bell Labs for around 20 years during it’s Golden Age. Professor at Chicago University for 23 years. He is one of the designers of SML, one of the fathers of HOPE the programming language that introduced the notion of Algebraic Datatypes. So this interview was very special to me personally where I could get to hear all the stories about the dawn of Functional Programming as we know. And it is my great pleasure to have the honor to share it with you all. Links David's Website David's Github Luca Cardelli and the Early Evolution of ML The History of SML HOPE SML Website SML/NJ Website SML/NJ Github SML Family Website…

Type Theory Forall

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#46 Realizability, BHK, CPS Translation, Dialectica - Pierre-Marie Pédrot 1:03:36

36 weeks ago1:03:36

1:03:36

In this episode Pierre-Marie Pédrot, one of the main Coq/Rocq developers joins us to talk about Krivine, Kleene and Gödel Realizability Models, how it relates to the BHK interpretation and CPS Translations, and how it was all already part of Gödel's work in Dialectica! If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall Links Pierre-Marie's Website Pierre-Marie's PhD Thesis (Very nice read) BHK Interpretation Type Theory Forall website Type Theory Forall discord…

Type Theory Forall

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#45 What is Type Theory and What Properties we Should Care About - Pierre-Marie Pédrot 1:21:41

36 weeks ago1:21:41

1:21:41

In this episode Pierre-Marie Pédrot who is one of the main Coq/Rocq developers joins us to talk about what is Type Theory, what is Martin-Löf Type Theory, what are the properties we should care about in our type theory and why. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall Links Pierre-Marie's Website Type Theory Forall website Type Theory Forall discord…

Type Theory Forall

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#44 Theorem Prover Foundations, Lean4Lean, Metamath - Mario Carneiro 2:13:31

39 weeks ago2:13:31

2:13:31

Mario Carneiro is the creator of Mathlib, Lean4Lean and Metamath0. He is currently doing his Postdoc at Chalmers University working on CakeML. In this episode we talk about foundations of theorem provers, type systems properties, semantics and interoperabilities. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall Links Lean4Lean github Metamath Metamath0 Lean Foundations Discussion Large Elimination / Singleton Elimination Type Theory Forall website Type Theory Forall discord…

Type Theory Forall

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#43 PL in the Industry and Summer Schools - Patrick and Eric 1:01:30

47 weeks ago1:01:30

1:01:30

In this episode Eric Bond and Patrick Lafontaine joins us to talk about the life in industry vs the life in academia. Eric is a PhD student at Michigan University under Max New, he works with some pretty cool esoteric cubical agda stuff. Before starting his PhD he has spent some time at the consultancy companies Two Six Technologies and 47 Degrees doing some cool functional programming and formal methods. Before that we were pals doing an internship at Galois, and even before that he finished his masters with Benjamin Delaware at Purdue, Patrick’s current advisor. Patrick has just returned from his internship at AWS in the automated reasoning team. So in this episode we talk about their research, their academic and industry experiences, how’s the industry looking like for opportunities in PL and all that. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall…

Type Theory Forall

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#42 Distributed Systems, Microservices, and Choreographies - Fabrizio Montesi 1:52:49

49 weeks ago1:52:49

1:52:49

In this episode we talk with Fabrizio Montesi, a Full Professor at the University of South Denmark. He is one of the creators of the Jolie Programming Language, President of the Microservices Community and Author of the book 'Introduction to Choreographies'. In today’s episode we talk about the formal side of Distributed Sytems, session types, the calculi that model distributed systems, their type systems, their Curry-Howard correspondences, and all the main ideas around these concepts. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall Links Fabrizio's Website Fabrizio's Linkedin Fabrizio's X / Twitter Fabrizio's Mastodon Fabrizio's Youtube Jolie's Website…

Type Theory Forall

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#41 The Value of PL (and) Education - Satnam Singh 1:41:04

51 weeks ago1:41:04

1:41:04

Satnam Singh has got incredible experience in both academia and industry. He has worked in Google, Facebook, Microsoft, Microsoft Research, Xilinx, etc. He has been a lecturer in Glasgow, Birmingham and University of California for a couple of years. He has worked with many interesting tools such Coq, Haskell, Verilog, Tensorflow. These days he works at Groq, applying FP to design silicon for machine learning. In this episode we talk about the value of specification, the current state of academia, gaming the metrics, functional programming in hardware, bullying, among other things. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall Links Personal Website Satnam's X Groq…

Type Theory Forall

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#40 Secure Voting - Joe Kiniry 1:08:54

1 year ago1:08:54

1:08:54

In this episode we go into a deep dive into the formal methods side of Voting systems, and for this nobody better than our guest: Joe Kiniry, A Principal Scientist at Galois, Principled CEO and Chief Scientist of Free & Fair, a Galois spin-out focused on high-assurance elections technologies and services. For the past 20 years Joe has worked tirelessly in designing, developing, supporting and auditing all kinds of voting systems for different private parties and government parties. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall Links Broken Ballots Joe Website Galois website SAW…

Type Theory Forall

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#39 Equality, Quotation, Bidirectional Type Checking - David Christiansen 1:49:42

1 year ago1:49:42

1:49:42

In this episode we continue our conversation with David Christiansen, he wrote the books Functional Programming in Lean and the Little Typer. He has also worked as the Executive Director of the Haskell Foundation, at Galois and did his PhD developing a bunch of cool stuff for Idris. In today’s episode we talk about the story behind writing The Little Typer together with Dan Friedman, and we get more technical by talking about Equality, Bidirectional Type Checking, Quotation and Quasi Quotation. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall Links: David's Website David's X Lean Zulip Chat Truth of a proposition, evidence of a judgement, validity of a proof…

Type Theory Forall

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#38 Haskell, Lean, Idris, and the Art of Writing - David Christiansen 1:55:58

1 year ago1:55:58

1:55:58

In this episode we talk with David Christiansen, he wrote the books Functional Programming in Lean and the Little Typer. He has also worked as the Executive Director of the Haskell Foundation, at Galois and did his PhD developing a bunch of cool stuff for Idris. David is a super upbeat person and I feel that we could spend hundreds of hours talking about Functional Programming Writing and Dependent Types, and we still wouldn’t run out of topics! If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall…

Type Theory Forall

1
#37 Compilers, Staging, Futamura Projections - Guannan Wei 1:53:20

1 year ago1:53:20

1:53:20

In this episode we talk with Guannan Wei, from Purdue University. Guannan finished his PhD last year under Tiark Rompf, and is currently doing his Post-Doc with Tiark. Guannan has worked on a plethora of different compilers topics, and in this conversation we will talk about Staging, Futamura Projections, Symbolic Execution, Compiler Applications in Smart Contracts and Quantum Programming. Towards the end of the episode we also talk about his application experiences for the position of a Professorship in the US an a few other contries. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall Links Guannan's Website @guannanwei on X…

Type Theory Forall

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#36 Behind the Person Behind this Podcast - Pedro Abreu 1:49:55

2 years ago1:49:55

1:49:55

In this episode we celebrate 3 years of existence of this podcast by reflecting on the journey so far, what is my philosophy, how do I approach the interviews, my overall goals for the show, and some of our plans for the future. In order to achieve this, I first take a detour and tell you a little more about my personal history, and my carreer in type theory and programming languages. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall…

Type Theory Forall

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#35 Teika, Self-Education and F***ing Floating Points - Eduardo Rafael 1:21:29

2 years ago1:21:29

1:21:29

In this episode we talk with Eduardo Rafael. He is self-thaught programming languages enthusiast, youtuber, twitch streamer, multi-skilled programmer that has worked in different aspects of computer science such as PL, operating systems, blockchain, and many other stuff. In this conversation we talk about his experience as a developer and hacker that didn’t follow the conventional paths of going to school and what are the strategies to navigate the vast ocean of knowledge without guidance of teachers or institutions. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall Links Eduardo's Twitter Eduardo's Twitch Eduardo's Youtube Feynman Algorithm…

Type Theory Forall

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#34 Foundations of Theorem Provers and Cedille2 - Andrew Marmaduke 1:28:27

2 years ago1:28:27

1:28:27

Andrew Marmaduke is a PhD Candidate from the University of Iowa, he works under Aaron Stump and has been working on revamping the theorem prover Cedille 2. In this episode we tackle fundamental questions about the foundations of the theorem provers, Cedille and Cedille 2. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall Links Andrew's Website AndrasKovacs' Smalltt Failure of Normalization in Impredicative Type Theory with Proof-Irrelevant Propositional Equality Impredicative Encodings of (Higher) Inductive Types…

Type Theory Forall

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#33 Z3 and Lean, the Spiritual Journey - Leo de Moura 2:05:07

2 years ago2:05:07

2:05:07

Not satisfied with implementing one of the most popular automated theorem provers, Z3, Leo de Moura also tackles another extremely hard problem in our field and implements a brand new interactive theorem prover from scratch, Lean. In this episode we dive into the mind and philosophy of this man. If you enjoy the show please consider supporting us at our ko-fi: https://ko-fi.com/typetheoryforall Links Leo's Website Lean Z3 The Church of Logic Podcast…

Type Theory Forall

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#32 TyDe Systems - Jan de Muijnck-Hughes 1:41:23

2 years ago1:41:23

1:41:23

In this episode we continue our conversation with Jan de Muijnck-Hughes a Research Associate at Glasgow University. He works using all sorts of fancy type systems mostly targeted for hardware specification, particularly with the aid of the theorem prover Idris. This episode we start by talking a little about Impostor Syndrome in academia and how he has learned to cope with it and then we dive deeper into the technicalities of his research, in particular his philosophy on Type Directed Design of Systems. We talk about Session Types, Graded Types, Quantitative types, etc. Don't forget to join our new discord channel! If you like our show please consider donating any amount at ko-fi . Links Jan's website Jan's twitter Jan's mastodon Writing and Speaking with Style Artifact Eval Andrej Bauer: Formalising Invisible Mathematics Hedy language (Felienne Hermans) Hermans' Inaugural Lecture on making PL human and inclusive Epistemic Injustice Richard Eisenberg interview 'Software Foundations' but in Agda 'System F for Fun & Profit' Reviewing Project Pages https://dsbd-appcontrol.github.io/ https://border-patrol.github.io/ Cool People Rachit Nigam Clement Pit-Claudel Software Idris Language Biblio…

Type Theory Forall

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#31 Discussing Problems in PL and Academia - Jan de Muijnck-Hughes 2:09:59

2 years ago2:09:59

2:09:59

In this episode we have a deep conversation with Jan de Muijnck-Hughes, talks about all the cool research he has done with idris, hardware and different kinds of interesting type systems such as session types, quantitative types and graded types. In the second half we discuss all the different kinds of problems that has been going on in PL academia lately and what we can do as a community to address those issues. Also, we have a discord channel now, join us! If you like our show please consider donating any amount at ko-fi . Errata: Jan mentions 'Jeff Foster' when, in fact, he meant Nate Foster This is the SIGCOMM 'Call': https://sigcomm.quest/ Felinne Hermans did her PhD at Eindhoven and not Delft Links Jan's website Jan's twitter Jan's mastodon Writing and Speaking with Style Artifact Eval Andrej Bauer: Formalising Invisible Mathematics Hedy language (Felienne Hermans) Hermans' Inaugural Lecture on making PL human and inclusive Epistemic Injustice Richard Eisenberg interview 'Software Foundations' but in Agda 'System F for Fun & Profit' Reviewing Project Pages https://dsbd-appcontrol.github.io/ https://border-patrol.github.io/ Cool People Rachit Nigam Clement Pit-Claudel Software Idris Language Biblio…

Type Theory Forall

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#30 Actors, GADTs and Burnout - Dan and Pedro 1:44:52

2 years ago1:44:52

1:44:52

In this episode we have over Dan Plyukhin, a PhD Candidate from the University of Illinois Urbana-Champaign. We talk about Dan’s research is in the field of parallelism, more specifically garbage collection in the presence of actors. Then we also talk about Pedro's research on translating GADTs from OCaml to Coq, and the burnout process that lead him to take 10 months off from his PhD to be with his family back in Brazil. Links Dan's Personal Website Twitter: @dplyukhn…

Type Theory Forall

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#29 Can PL theory make you a better software engineer? - Jimmy Koppel 1:24:19

2 years ago1:24:19

1:24:19

Jimmy Koppel, got his PhD at MIT and found the Mirdin Company, where he teaches engineers to write better code! In this interview we talk about how to make better code, how the knowledge of computer science theory and programming languages can help engineers to achieve that, and much more! Links Jimmy's Personal Website Jimmy's Twitter Mirdin's Website Jimmy's Blog Lastest blog post One CFG-Generator to Rule Them All Automatically Deriving Control-Flow Graph Generators from Operational Semantics Thiel Fellowship Newsletters discussed in the show Mirdin's Newsletter Hillel Wayne's Newsletter Eric Normand's Newsletter Jeremy Kun's Newsletter…

Type Theory Forall

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#28 Formally Verifying Smart Contracts - Pruvendo 1:10:40

2 years ago1:10:40

1:10:40

In this episode we host another company that does formal method in the context of the Everscale Blockchain, and Solidity smart contracts. How and why they use formal methods in this context? Who are their clients? What are the caveats? Links Pruvendo's Website Pruvendo's Linkdin Pruvendo's Twitter

Type Theory Forall

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#27 Formalizing an OS: The seL4 - Gerwin Klein 1:58:40

3 years ago1:58:40

1:58:40

In this episode talk with Gerwin Klein about the formal verification of the microkernel seL4 which was done using Isabelle at NICTA / Data61 in Australia. We also talk a little about his PhD Project veryfing a piece of the Java Virtual Machine. Links Gerwin's Twitter Gerwin's Website ProofCraft's Website…

Type Theory Forall

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#26 Mechanizing Modern Mathematics - Kevin Buzzard 2:15:31

3 years ago2:15:31

2:15:31

Kevin Buzzard has been very passionate spreading the word among mathematicians to use theorem provers mechanize theorems of modern mathematics. In this conversation we will talk about his vision in teaching undergrads to use the Lean theorem prover, what is the Xena Project, his view of how theorem provers can change the way we do mathematics, and much more! Links Xena's Project Twitter Xena Project's Website Lean's Website…

Type Theory Forall

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#25 Formally Verifying the Tezos Codebase - Formal Land 1:01:32

3 years ago1:01:32

1:01:32

In this episode we partner with Formal Land, a company that works in formally verifying the Tezos codebase! I have worked with them in the past developing new features to their source-to-source compiler CoqOfOcaml. In this episode we talk about their work with Tezos and how their techniques are applicable to other codebases as well! For this we talk with Formal Land founder Guillaume Claret and the proof engineers Daniel Hilst and Pierre Vial. Links Formal Land Website Formal Land Email: contact@formal.land Formal Land Twitter: @LandFooBar CoqOfOcaml The DAO hack…

Type Theory Forall

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#24 The History of Isabelle - Lawrence Paulson 1:38:02

3 years ago1:38:02

1:38:02

In this episode we interview Lawrence Paulson, one of the creating fathers of Isabelle. We talk about the development process, how it drew inspirations and ideas from LCF and Boyer Moore. What tools were used, it’s strenghts and weaknesses, and all about the historical context at the time! We also briefly talk about his formalization of the Gödel's Incompletenes theorems in Isabelle Paulson have quite an extensive CV, he is a professor at Cambridge, have published more than 100 papers, is an ACM fellow since 2008, is a member of the royal society since 2017, among many other things! Links Larry's Website Larry's Twitter Larry's Blog…

Type Theory Forall

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#23 What is the SIGPLAN? - Jens Palsberg and Jonathan Aldrich 1:12:13

3 years ago1:12:13