hsfzLZH1's Homepage
2026
- A one-sided inverse that cannot be reversed in a group algebra
- Vanishing self-extensions need not make a module projective
- The largest relation counts come from a lex-plus-powers ideal
- Two algebraic generators can produce an infinite-dimensional division ring
- Counting modular representations from local weights
- Bounded local defect leaves only finitely many block theories
- Tensor invariants for even spin groups need no extra dilation
- A group-algebra trace can remember only finitely many torsion classes
- One irreducible representation whose square contains every other
- A regular local ring can lose integral K-theory at its fraction field