hsfzLZH1's Homepage
2026
- When geometry and operator indices part company: three group-algebra counterexamples
- Recovering arithmetic groups from their operator algebras
- How large can a quantum query advantage be? The quartic boundary
- Can an operator algebra forget how many free generators it had?
- When nearby operator algebras are the same—and when they are not
- Simpler subalgebras that preserve every modular commutation constraint
- Three forms of regularity become one: comparison, dimension and Jiang–Su absorption
- A concrete algebra that cannot fit inside any nuclear norm ultrapower
- Can every bounded representation be made to respect adjoints?
- Operators with invariant subspaces but no hyperinvariant ones