2 papers
math.MG2026
An AI Generated Counterexample to Borsuk Problem in Dimension 63
Yibo Ji
We construct a 321 point set in R^63 that cannot be partitioned into 64 subsets of smaller diameter, proving b(63)>=65. Starting from the G_2(4) Euclidean representation and the Je…
math.AG2025
Bow varieties as symplectic reductions of
Yibo Ji
Cherkis bow varieties were introduced as ADHM type description of moduli space of instantons on the Taub-NUT space equivariant under a cyclic group action. They are also models of…