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I am Risan, a mathematics master's student at Nagoya University under Prof. Henrik Bachmann, with research interests in finite multiple zeta values and modular forms. My background also includes a strong focus on computer science, particularly in algorithms.
I represented Indonesia in the International Olympiad in Informatics (2008-2009) and Nanyang Technological University at the ACM ICPC World Finals (2012). I was rated red on Codeforces (link here, before recent rating recalculations due to inflation).
Previously, I was a senior software engineer and Tech Lead at Google, a software engineer at Facebook (now Meta) and served as a primary coach for the Indonesian national team for the International Olympiad in Informatics.
Please reach out on LinkedIn.
Education
Education
Master of Mathematical Science, Nagoya University, Japan, 2022-2025.
Thesis: Formal finite multiple zeta values and modular forms (updated 24 April 2025).
B. Eng. (majored in computer science, minored in mathematics), Nanyang Technological University, Singapore, 2009-2013.
Teaching
Teaching
Teaching Assistant for Mathematics for Machine Learning, Fall 2024, Nagoya University, Japan.
Qualified Teaching Assistant (here for more information) for Data Science Exercise B, Spring 2023, Nagoya University, Japan.
Teaching Assistant for Mathematics for Machine Learning, Fall 2023, Nagoya University, Japan.
Qualified Teaching Assistant (here for more information) for Data Science Exercise B, Spring 2022, Nagoya University, Japan.
Teaching Assistant for Linear Algebra II, Spring 2022, Nagoya University, Japan.
Teaching Assistant for Linear Algebra I, Fall 2022, Nagoya University, Japan.
Teaching Assistant for Mathematics for Machine Learning, Fall 2022, Nagoya University, Japan.
Trainer for Binus University ACM ICPC teams in 2013, Indonesia.
One of the main coaches for the Indonesian national team for the International Olympiad in Informatics from 2009 to 2013.
Next talk
Next talk
None scheduled.
Previous talks
Previous talks
Formal multiple zeta values and modular forms, 2nd Kindai Workshop (Multiple Zeta Values and Modular Forms), 8 November 2024, Kindai University, Japan.
Formal multiple zeta values and modular forms, 19 September 2024, Nagoya University, Japan.
Formal multiple zeta values and modular forms, 第17回ゼータ若手研究集会, 15-18 February 2024, Kyushu University, Japan.
Quasi-shuffle products III, Seminar on Hopf algebras, 20 November 2023, Nagoya University, Japan.
Quasi-shuffle products II, Seminar on Hopf algebras, 13 November 2023, Nagoya University, Japan.
Finite multiple zeta values and modular forms, ENTR Workshop, 23 August 2023, Bielefeld University, Germany.
Next event
Next event
None scheduled.
Previous events
Previous events
Modular forms and multiple zeta values, 17-22 February 2025, Kindai University, Japan.
Lectures on multiple zeta values and beyond, 10-15 February 2025, Kyushu University, Japan.
Sendai seminar on multiple Eisenstein series, 8 December 2024, Tohoku University, Japan.
関西多重ゼータ研究会第66回, 7 December 2024, Tohoku University, Japan.
2nd Kindai Workshop (Multiple Zeta Values and Modular Forms), 8-10 November 2024, Kindai University, Japan.
第17回ゼータ若手研究集会, 15-18 February 2024, Kyushu University, Japan.
関西多重ゼータ研究会第63回, 25 October 2023, Osaka Institute of Technology, Japan.
The Early Number Theory Researchers Workshop (ENTR), 23 August 2023 (Online), Bielefeld University, Germany.
Formalization of multiple Eisenstein series, 6-7 June 2023, Kyushu University, Japan.
多重ゼータ研究集会, 20-22 February 2023, Kindai University, Japan.
The 16th Young Mathematician Conference on Zeta functions, 16-19 February 2023, Nagoya University, Japan.
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