## Problem 219 — rank:327

**Title:** Epidemic structural uncertainty

**Added binding assumptions (LaTeX):**

```latex
Finite-expert delayed-feedback regret bounds for bounded convex losses are established under suitable online protocols, including adversarial outcome sequences. Do not present their existence alone as unresolved. State comparator complexity, model-entry rules and feedback availability; an oracle choosing a new expert after each outcome is a different benchmark. The biological task is structural-shift evaluation and meaningful calibration despite misspecified constituent models.
```

**Direct edits:** 0. **Fresh external checks:** None; supplied sources retained as provenance.