* portrait *

Department of Mathematics,

Tokyo Institute of Technology,

2-12-1 Ookayama, Meguro-ku

Tokyo 152-8551, Japan

Tokyo Institute of Technology,

2-12-1 Ookayama, Meguro-ku

Tokyo 152-8551, Japan

Email: evaluate

`'@'.join(['.'.join(['yuyama','t','aa']),'.'.join(['m','titech','ac','jp'])])`

as a Python expression.I am a graduate student in the doctoral course at Tokyo Institute of Technology. My advisor is Fumiharu Kato.

Keywords: mathematical logic, computability theory, undecidable problems, formal language theory, word problem for groups

- Yuyama, Takao. More on Groups and Counter Automata. arXiv preprint. arXiv:2210.16879.
- Kashima, Ryo; Matsuda, Naosuke; Yuyama, Takao. Term-Space Semantics of Typed Lambda Calculus. Notre Dame J. Formal Logic 61 (2020), no. 4, 591--600. doi:10.1215/00294527-2020-0028.
- Yuyama, Takao. On Hilbert's tenth problem over subrings of Q (.pdf), masters thesis, Tokyo Institute of Technology, 2020.

- On Hilbert's tenth problem over subrings of Q (.pdf), 数学基礎論若手の会2019 (December 8, 2019; Aichi, Japan).
- Undecidability of Hilbert's Tenth Problem and its Applications (.pdf), Automata and Logic Workshop in AKITA (March 27, 2019; Akita University, Japan),
**Best Presentation Award**. - Decidability of Presburger Arithmetic via Finite Automata (.pdf), Automata and Logic Workshop in AKITA (March 26, 2019; Akita University, Japan),
**invited lecture**. - Matrix Mortality Problem (.pdf) (in Japanese), 数学基礎論若手の会2018 (November 24, 2018; Okinawa, Japan).