Portfolio item number 1
Short description of portfolio item number 1
Short description of portfolio item number 1
Short description of portfolio item number 2 
Published in Journal 1, 2009
This paper is about the number 1. The number 2 is left for future work.
Recommended citation: Your Name, You. (2009). "Paper Title Number 1." Journal 1. 1(1).
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Published in Journal 1, 2010
This paper is about the number 2. The number 3 is left for future work.
Recommended citation: Your Name, You. (2010). "Paper Title Number 2." Journal 1. 1(2).
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Published in Journal 1, 2015
This paper is about the number 3. The number 4 is left for future work.
Recommended citation: Your Name, You. (2015). "Paper Title Number 3." Journal 1. 1(3).
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Published in GitHub Journal of Bugs, 2024
This paper is about fixing template issue #693.
Recommended citation: Your Name, You. (2024). "Paper Title Number 3." GitHub Journal of Bugs. 1(3).
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Published in GitHub Journal of Bugs, 2024
This paper is about a famous math equation, \(E=mc^2\)
Recommended citation: Your Name, You. (2024). "Paper Title Number 3." GitHub Journal of Bugs. 1(3).
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Published:
This is the “3+X” seminar on Heegaard Splitting, organized by Prof. Yi Liu and Prof. Jiajun Wang in 2025 Spring at Peking University. The reference is M. Scharlemann’s Heegaard splittings of compact 3-manifolds.
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This is the geometry seminar organized by Ziqiang Bao in 2025 Spring at Peking University. The reference is J. Stillwell’s Geometry of Surfaces.
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This is the “3+X” seminar on CAT(0) spaces, organized by Prof. Wenyuan Yang in 2025 Fall at Peking University. The reference is M. R. Bridson and A. Haefliger’s Metric Spaces of Non-Positive Curvature.
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This is the “3+X” seminar on Knots and Links, organized by Prof. Yi Liu and Prof. Jiajun Wang in 2025 Fall at Peking University. The reference is D. Rolfsen’s Knots and Links.
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This is the “3+X” seminar on CAT(0) Cube Complexes, organized by Prof. Yi Liu, Prof. Jiajun Wang, and Prof. Wenyuan Yang in 2026 Spring at Peking University. The reference is mainly P. Schwer’s CAT(0) Cube Complexes: An Introduction.
Published:
I introduced the group actions on trees, and discussed which groups must act with a fixed point on every tree. A central example is \(\mathrm{SL}_2(\mathbb{Z})\), which can act on a tree without fixed points, while \(\mathrm{SL}_3(\mathbb{Z})\) always fixes a point. Notes
Undergraduate course, University 1, Department, 2014
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Workshop, University 1, Department, 2015
This is a description of a teaching experience. You can use markdown like any other post.