R. Hoekzema

activity

20202026

collaborators

3 papers

math.CO2026

Nested tree space: a geometric framework for co-phylogeny

G. Grindstaff, R. S. Hoekzema

Nested (or reconciled) phylogenetic trees model co-evolutionary systems in which one evolutionary history is embedded within another. We introduce a geometric framework for such sy…

math.AT2025

SKK groups of manifolds and non-unitary invertible TQFTs

Renee S. Hoekzema, Luuk Stehouwer, Simona Veselá

This work considers the computation of controllable cut-and-paste groups $SKK_{n}^{ξ}$ of manifolds with tangential structure $ξ : B_{n} \to B O_{n}$ . To this end, we apply the work o…

math.AT2020

Orientability of high-dimensional manifolds with odd Euler characteristic

Renee S. Hoekzema

We call a manifold $k$ -orientable if the $i^{t h}$ Stiefel-Whitney class vanishes for all $i < 2^{k}$ ( $k \geq 0$ ), generalising the notions of orientable (1-orientable) and spin (2-ori…