## Problem 014 — rank:53

**Title:** Plasma-membrane organisation

**Added binding assumptions (LaTeX):**

```latex
The displayed density equation is only a mean-field balance; it does not by itself determine single-particle trajectories or pair correlations. Supply an interacting-particle law or a closed hierarchy consistent with that balance. Define $g_{\ell p}$ as a ratio of second-order product density to the specified inhomogeneous intensity product, using surface geodesic distance, an edge correction and a fixed lag convention.
```

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