hsfzLZH1's Homepage
2026
- Counting solutions faster than the Exponential Time Hypothesis allows
- A smooth surface metric that cannot fit locally in three-space
- Every closed surface metric in four-dimensional Euclidean space
- How negative scalar curvature pays for topological complexity
- Positive spectral curvature and a controlled loss of two dimensions
- Sharp isoperimetry and fillings in nonpositive curvature
- Positive bisectional curvature and global complex coordinates
- When geodesic entropy forces local symmetry
- An exact Lagrangian that cannot be untied by Hamiltonian motion
- Deforming positive triples into hyperkähler geometry