### Lower bounds for MTS

We prove lower bounds for MTS on certain classes of ultrametrics

### Approximation by ultrametrics

The competitive ratio for MTS is controlled by ultrametrics

### Metrical task systems on a weighted star

Using the mirror descent framework for MTS

### Navigating a convex body online

Continuous-time mirror descent analysis

### Regret minimization and competitive analysis

Regret minimization vs. competitive analysis

### tcsmath relaunch

A relaunching of tcsmath

### An entropy optimal drift

Föllmer's drift, Ito's lemma, and the Gaussian log-Sobolev inequality