Nikoleta Glynatsi

Thank you @ignat1.bsky.social for inviting me to contribute!

More info: game-theory-school.kse.ua

A huge present for my small contribution at the Game Theory Summer School in Kyiv arrived today! 🎁

The school was jointly organised by the Kyiv School of Economics and the Ukrainian Catholic University. The main work was carried out by the local organisers, who put together an excellent programme 🙏

Our framework offers a rigorous foundation for understanding how social norms evolve and persist, even when people sometimes misjudge, act randomly, or punish at a cost.

It unifies earlier results and opens the door to studying robust cooperation in complex societies.

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Some of these norms are especially interesting: they fix the payoff of any mutant strategy, similar to zero-determinant strategies in direct reciprocity (Press & Dyson 2012).

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In our new work, we analytically characterize all stable norms under public assessment.

✅ We recover the known cooperative norms
✅ We extend to cases with errors and costly punishment
✅ And we discover new, more general stable norms

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Previous studies found a few “good” norms (like the famous leading eight) that can sustain cooperation.

But we still lacked a complete analytical characterization of all evolutionarily stable norms, especially when actions or judgments are noisy, or when punishment is possible.

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Indirect reciprocity means:

👉 I help you,
👉 others see that,
👉 and later, someone else helps me.

This works only if society shares a norm about who deserves help. These norms link actions to reputations, and reputations to future treatment.

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Exact conditions for evolutionary stability in indirect reciprocity under noise Author summary Understanding how cooperation can evolve and be sustained is a central question in evolutionary biology and social science. One prominent explanation is indirect reciprocity, where indi...

🗞️📣 New paper "Exact conditions for evolutionary stability in indirect reciprocity under noise" with @chilbe.bsky.social & @yohm.bsky.social

How can cooperation persist in large groups of unrelated individuals? Reputation 🗣️ But which social norms make this stable, even when mistakes happen?

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🌏 #ICSD2026 is on!
Great meeting, amazing location, and an even cooler logo! 😄
Join us in Shimonoseki, Japan! 🇯🇵

Great food, inspiring scientific discussions, and drinking sessions 🍻🙈

It was also my first time visiting Korea, and definitely not the last 🇰🇷✨

🔗 www.apctp.org/theme/d/html...

Attended my first RHINO conference (APCTP Workshop on the Roles of Heterogeneity in Nonequilibrium) this weekend 🎉 where I had the pleasure of giving an invited talk.

The event was held at Pukyong National University, Busan, & was wonderfully organized by Seung Ki Baek + Eun Lee 🙏 🙇‍♀️

APCTP APCTP

We're organizing the "APCTP Workshop on the Roles of Heterogeneity in Nonequilibrium (RHINO 2025)"; the workshop will be held from 29 August to 1 September 2025 in Pukyong National University (PKNU), Busan, Korea.

www.apctp.org/theme/d/html...

GitHub - Nikoleta-v3/Game-theory-summer-school-Kyiv Contribute to Nikoleta-v3/Game-theory-summer-school-Kyiv development by creating an account on GitHub.

If you're curious about my talk, the materials are available on GitHub: github.com/Nikoleta-v3/... 📚

+ Yesterday, I gave a lecture on computational approaches to game theory at a summer school in Kyiv. You can find more information about the summer school, and a very impressive list of speakers, here: game-theory-school.kse.ua 🎲🧮🇺🇦

It was also my first time visiting China, and it’s safe to say I’ll be going back soon!

Here are a few random pictures from Hangzhou and Beijing.

Last week, I had the pleasure of attending EGAI (Game Theory & Artificial Intelligence Conference) 🎲🤖 as an invited speaker. This conference is becoming the main event for bringing together the game theory community in 🇨🇳 I wrote a short post about the conference here: nikoleta-v3.github.io/egai/

Just published in JOSS: 'HeXtractor: Extracting Heterogeneous Graphs from Structured and Textual Data for Graph Neural Networks' https://doi.org/10.21105/joss.08057

An incredible opportunity! 📰🎉 Join our research group exploring social questions, work with an amazing supervisor, and live in Japan for a few years while you're at it! 🇯🇵🍜

Some amazing work by @franzilesi.bsky.social on repeated games! In this new paper, she describes the conditions under which a player can remember less than their opponent and still achieve a best response. See 🧵👇

This is my first last-author publication! Feeling like a wise person already 🧙‍♂️

Thank you Diogo 🙏🏻🥳

A great summary of our recent articles, now live here 👇 The work was conducted at the MPI for Evolutionary Biology🧑🏻‍🔬 Check it out to learn more about game theory and cooperation 🤝

Hahaha my moment of fame! Thank you for sharing 🙌🏻☺️

Thank you 😁

Thank you very much Catherine! 🙌🏻

Thank you! Looking forward to inviting you here soon 😁🙌🏻

I am very grateful to @chilbe.bsky.social and the DYNOSOBs group for the past four years! I will remain an external member of the group, a nice way to still being able to enjoy the perks of the group! 😁 🦖

For those in the social behavior, cooperation, and game theory circles, you have probably heard of this team due to the amazing work done here by @yohm.bsky.social 🤝

I am genuinely very excited to announce that I am officially a Research Scientist at the RIKEN Center for Computational Science in the Discrete Event Simulation team, led by Nobuyasu Ito! 🇯🇵 🗾 🗻

Happy holidays everyone 🌨️ and here’s to a 2025 filled with cooperation, adaptability, and success! 🎇

What does this mean for real life? Success depends on balancing generosity, and adaptability. Cooperation works, but only when it aligns with the environment you’re in.