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　　September 24, 2026, Professor Dongsu Kim from the Gwangju Institute of Science and Technology (GIST), was invited to give a talk. The title is "Combinatorics and Arithmetic of Binomial-Secant Number Identities". For more information, see the poster.

　　Professor Dongsu Kim is an Emeritus Professor at the Korea Advanced Institute of Science and Technology (KAIST) and has served as a Distinguished Chair Professor at the Gwangju Institute of Science and Technology (GIST) since September 2025. Professor Kim is an internationally recognized authority in enumerative and bijective combinatorics. He has published numerous research papers in leading mathematical journals, including Inventiones Mathematicae. He has also made significant contributions to the development of enumerative combinatorics in Korea, mentoring and training many outstanding researchers in the field, including Professor Ae Ja Yee and Professor Jang Soo Kim.

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