## Problem 191 — rank:95

**Title:** High-dimensional coexistence

**Added binding assumptions (LaTeX):**

```latex
Specify how singular $A$ is handled, for example by assigning the event false or proving singularity has probability zero. Sign truncation must preserve the stated centering and covariance through the actual paired law, not an inconsistent post hoc truncation. Bound trajectory growth on the ensemble and state how total biomass scales with $S$; a fixed positive abundance floor for every species may otherwise make the event infeasible as richness grows.
```

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