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On October 16-18, we participated in NixCon 2020. Here's the details of our participation.

Serokell at NixCon 2020

On October 16-18, we participated in NixCon 2020. 

NixCon is an annual conference for contributors and users of [Nix](https://serokell.io/blog/what-is-nix) and NixOS. 

It’s an event we keep participating in every year, [including the previous one](https://serokell.io/blog/serokell-nixcon2019). This year, due to the COVID crisis, it was done remotely. 

One of our employees, Alexander Bantyev, participated with a talk on Nix flakes in production, a thing we have been working for some time now. 

If you’re interested, here’s the talk. You can also see all the other talks of the event on their YouTube channel. 

<iframe width="560" height="315" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" data-src="https://www.youtube.com/embed/7sQa04olUA0?start=9117"></iframe>

About a week ago, we participated in ZuriHac, the biggest Haskell Hackathon in the world, and want to tell you how it was.

About a week ago, we participated in [ZuriHac](https://zfoh.ch/zurihac2019/), the biggest [Haskell](https://www.haskell.org/) Hackathon in the world. During the event, we visited several talks, the most popular among which were those about GHC, and organized a Morley workshop together with the Tocqueville Group.

The participants of our workshop could use a special [web page](https://morley-zurihac.serokell.io/) to learn about Michelson and Morley as well as check the issues prepared for them. On Saturday and Sunday, all comers had a chance to discuss Michelson, ask questions, read tutorials, set up their working environments and try to solve our issues.

One of the participants, [Sébastien](https://besnier.se/), successfully implemented an [optimizer](https://hackage.haskell.org/package/morley-0.5.0/docs/Michelson-Optimizer.html). He presented his work during the project demos, and it was really impressive. It worked as expected on artificial examples, and it also optimized our DS protocol contract. After ZuriHac, we modified Sébastien’s work a bit and made a [merge request](https://gitlab.com/morley-framework/morley/merge_requests/2), which we’re going to review soon.

Many thanks to all the ZuriHac participants! We love the Haskell community and hope to see you all soon again.

Serokell at ZuriHac 2019

Vladislav Zavialov Has Been Accepted Into GHC Steering Committee

Vladislav Zavialov, the leader of our GHC team, has recently joined the GHC Steering Committee.

Vladislav Zavialov, the leader of our GHC team, has recently joined the GHC Steering Committee.

GHC Steering Committee works to guide the process of GHC change proposals and to decide which GHC proposals are adopted and which are not. 

Since GHC is the most widespread Haskell compiler (by a significant margin) in the industry, the committee is basically making choices on which features will be added to the language. Therefore, being a part of it is an important role that brings a lot of responsibilities.

We’re happy that Vladislav has stepped up to take this role and we hope that his work will help Haskell become an even more awesome language! 

If you want to learn more about Vladislav and our work on GHC, we recommend checking out [the interview](https://serokell.io/blog/developing-ghc-for-a-living) we did with him last year.

Read about the participation of our logician Danya Rogozin at LCFS 2020 and the thesis about which he gave his talk there.

##

On the 7th of January, Danya Rogozin participated in the conference Logical Foundation of Computer Science, Miami, Deerfield Beach. [LFCS](https://lfcs.ws.gc.cuny.edu/lfcs-2020/) is a logical and computer science conference, topics of which cover such areas as constructive mathematics, type theory, proof theory, foundations of mathematics, etc. 

![logical foundations of computer science](/files/0f/0f2k6r53.logo_general2.png " ")

Danya gave a talk on the results that he obtained in his thesis two years ago. The title is Modal Type Theory Based on the Intuitionistic Modal Logic ${\bf IEL}^{-}$. This logic [was introduced by Sergei Artemov and Tudor Protopopescu](https://arxiv.org/abs/1406.1582) to solve some issues related to constructive aspects of agent knowledge and belief.

## Considering modal logic from a computational perspective

This logic was considered from a computational perspective. It's a quite curious coincidence that axioms of this logic are pretty similar to the types of methods `pure` and `(<*>)` in the Applicative class well-known in Haskell. In this work, he considered the modal typed lambda calculus that is Curry-Howard isomorphic to the logic  ${\bf IEL}^{-}$ and shown such metatheoretical properties as subject reduction, strong normalisation, and confluence.

To get a closer look, you may check out [the proceedings book](https://www.springer.com/gp/book/9783030367541), where the articles based on the speakers' talks are fully presented.

Also, if you want to read some of Danya's introductory work about modal logic, feel free to head to his [excellent post series](https://serokell.io/blog/incomplete-and-utter-introduction-to-modal-logic) on our blog. In it, he covers the basics of modal logic and explores its connections to fields such as computer science, topology, and foundations of mathematics.

Serokell at LCFS 2020

Viktor Kazanski

Denis Oleynikov

Pavel Golovin

Mika Logan

Constantine Ter-Matevosian

Alexey Danilevsky

Vladimir Serov

Nikolay Yakimov

Inna Logunova

Ivan Smetannikov

Aleksandr Pak

Leonid Vasilev

Ilya Lubimov

Andrey Borzenkov

Markus Barenhoff

Kirill Kizilov

Kristina Martin

Nurlan Alkuatov

Jay Zelenskyi

Adrián Enríquez

Anton Sorokin

Uliana Sushinskaia

Vadym Salnyk

Daniel Kazantsev

Vito Canadi

Chris Höppner

Lars Jellema

Yorick van Pelt

Yegor Timoshenko

George Agapov

Kirill Andreev

Brian Kean

Val Baturin

Kyrill Briantsev

John Burnham

Ivan Dolgakov

Kirill Elagin

Pavel Gliev

Joakim Goldkuhl

Ivan Gromakovsky

Kostya Ivanov

Murat Kasimov

Alexander Rukin

Vasiliy Kevroletin

Mikhail Kilianovski

Maxim Koltsov

Dmitry Kovanikov

Artem Kuznetsov

Nikita Lisitsa

Allan Lukwago

Dmitry Mukhutdinov

Alexander Nikolaev

Dmitry Nikulin

Konstantin Andriotis

Artem Ohanjanyan

Ilya Peresadin

Pasquale Pinto

Danya Rogozin

Rinat Stryungis

Alexander Tiunov

Paul Tsupikoff

Mitchell Vitez

Josef Vlach

Mikhail Volkhov

Murad Murzaev

Vladislav Zavialov

Arseniy Seroka

Jons Mostovojs

Felix Stegerman

Roman Melnikov

Jaroslav Shadrin

Marina Sharygina

Leonid Cupikov

Ping Chen

Sergey Litovchenko

Nadir Asanbekov

Dmitry Lifanov

test1

Domagoj Cerjan

Ellina Poponnikova

Dmitrii Susloparov

Damir Garifullin

Aleksandr Pakulev

Kirill Kuvshinov

Roman Alterman

Anton Dobrenkiy

Alexandra Voicehovska

Eduard Sachava

Sandeep Chandrika

Grigory Pevnev

Artem Velychko

Olga Bolgurtseva

Yulia Gavrilova

Zhenya Vinogradov

Alexander Bantyev

Stepan Prudnikov

Moremi Vannak

Fedor Fedorov

Krisztián Ádám

Alyona Antonova

Artem Yurchenko

Diogo Castro

Heitor Toledo Lassarote de Paula

Ilona Prikule

Natalya Kokova

Daria Smirnova

Serokell PR

Gints Dreimanis

Ivan Markov

Andrey Demidenko

Dmitriy Mozhevitin

Iurii Kravchenko

Vlad Shcherbina

Preetham Gujjula

Dina Safullina

Alexey Khaciyants

Dmitri Puzyrev