Archive
Papers
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I. Choi, A solution to Haagerup’s problem and positive Hahn-Banach separation theorems in operator algebras, J. Funct. Anal. 290 (2026), no.~2, Paper No.~111228, 11 pp.
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I. Choi, Curved folding and planar cutting of simple closed curve on a conical origami, Kodai Math. J. 39 (2016), no.~3, 579–595.
Talks
2026
2025
KK-theory as a stable infinity category
| 9/3 | Matsuyama, Functional Analysis Conference (Junior) |
A solution to Haagerup's problem on normal weights
| 5/13 | Tokyo, Operator Algebra Seminars at the University of Tokyo |
| 6/6 | Kyoto, Kyoto Operator Algebra Seminars |
| 7/8 | Seoul, China-Japan-Korea Conference on Functional Analysis |
| 7/14 | Seoul, KIAS Seminars |
| 9/24 | Kyoto, Operator Algebraists’ Symposium, Recent Developments in Operator Algebras |
2024
Unbounded bivariant K-theory
| 9/18 | Sapporo, Functional Analysis Conference (Junior) |