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.

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. I studied in several inland cities in northern China and worked briefly at a media company as a junior columnist during the COVID-19 pandemic in 2022.


Academic service
News
2026
Our paper A Bi-nested Calculus for Intuitionistic K: Proofs and Countermodels has been accepted for publication at the Journal of Applied Non-Classical Logics. The preprint is available here .
Apr 08
2025
I started working as a postdoctoral researcher at Institute of Computer Science of the Czech Academy of Sciences (ICS CAS).
Oct 01
I gave a talk at the conference Synthetic mathematics, logic-affine computation and efficient proof systems held at CIRM, Luminy.
Sep 08
I presented two papers at WoLLIC 2025, with the proceedings available here .
Jul 14
Selected Publications (view all )
Local Intuitionistic Modal Logics and Their Calculi
Local Intuitionistic Modal Logics and Their Calculi

Philippe Balbiani, Han Gao, Çiğdem Gencer, Nicola Olivetti

International Joint Conference on Automated Reasoning (IJCAR 2024) conference paper

Local Intuitionistic Modal Logics and Their Calculi

Philippe Balbiani, Han Gao, Çiğdem Gencer, Nicola Olivetti

International Joint Conference on Automated Reasoning (IJCAR 2024) 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