hsfzLZH1's Homepage
2026
- The same metric shape can hide different linear Banach spaces
- A sharp numerical-range bound for matrix functions
- Can every Banach space have a separable infinite-dimensional quotient?
- When cotype on both sides forces nontrivial type
- Fixed points for nonexpansive maps in reflexive spaces
- Random walks detect superreflexive Banach spaces
- A claimed failure of universal entropy duality
- Discrete distances do not guarantee bounded approximation
- Midpoint convexity without asymptotically convex renormings
- Markov cotype of ℓ1 and Lipschitz extension