Han GAO

Welcome to my homepage!

I am a postdoctoral researcher in the LogICS group at the Institute of Computer Science of the Czech Academy of Sciences. I am a member of the Metalogic Group, working on the INTERACT project (PI: Dr. Wesley Fussner).

My research specializes in structural proof theory for non-classical systems comprising modal and substructural logics. I focus on the development of structured calculi—notably variants of nested sequent calculi—investigating their properties and applications within various logical contexts.

Prior to the current position, I completed my Ph.D. in October 2025 under the supervision of Prof. Nicola Olivetti at Laboratoire d'Informatique et Systèmes (LIS), affiliated with Aix-Marseille Université and CNRS. In my thesis, I conducted proof-theoretic studies on (intuitionistic) modal logics. Before starting my Ph.D., I received my Master's degree in 2022 and Bachelor's degree in 2019.

My complete academic résumé is available upon request.


Some personal history: I was born and raised in 江苏 - Jiangsu, which is China's most beautiful and open-minded province. I spent my childhood in 东台 - Dongtai and three years of adolescence in 苏州 - Suzhou. From 2015 to 2022, I studied in several inland cities in northern China. During the COVID-19 pandemic in 2022, I briefly worked as a junior columnist at a media company in Beijing, during which time I wrote several articles on international affairs.


Academic service
News
2026
I visited Marianna Girlando at the ILLC of the University of Amsterdam for one week and gave a talk at the LLAMA seminar.
May 18
Our paper Taming Complexity in Intuitionistic Modal Logic: the case of FIK and its shallow calculus has been accepted at AiML 2026.
Apr 27
Our paper A Bi-nested Calculus for Intuitionistic K: Proofs and Countermodels has been accepted for publication at Journal of Applied Non-Classical Logics. The preprint is available here.
Apr 08
Selected Publications (view all )
Taming Complexity in Intuitionistic Modal Logic: the case of FIK and its shallow calculus
Taming Complexity in Intuitionistic Modal Logic: the case of FIK and its shallow calculus

Han Gao, Nicola Olivetti

Advances in Modal Logic (AiML 2026). To appear. conference paper

Taming Complexity in Intuitionistic Modal Logic: the case of FIK and its shallow calculus

Han Gao, Nicola Olivetti

Advances in Modal Logic (AiML 2026). To appear. conference paper

A Natural Intuitionistic Modal Logic: Axiomatization and Bi-Nested Calculus
A Natural Intuitionistic Modal Logic: Axiomatization and Bi-Nested Calculus

Philippe Balbiani, Han Gao, Çiğdem Gencer, Nicola Olivetti

32nd EACSL Annual Conference on Computer Science Logic (CSL 2024) conference paper

A Natural Intuitionistic Modal Logic: Axiomatization and Bi-Nested Calculus

Philippe Balbiani, Han Gao, Çiğdem Gencer, Nicola Olivetti

32nd EACSL Annual Conference on Computer Science Logic (CSL 2024) conference paper

All publications