## Problem 170 — rank:160

**Title:** Recombination-landscape evolution

**Added binding assumptions (LaTeX):**

```latex
Interpret $r_t(x)$ as an expected crossover-event intensity per base per meiosis; over a noninfinitesimal interval it is not generally the probability of at least one event. Specify whether $m_t$ is an individual modifier genotype or a population state with allele frequencies. Break maps and crossover maps have different observation laws. Irreducibility on a finite molecular state space implies an invariant distribution, so any nonexistence claim must concern the actual infinite or time-inhomogeneous model.
```

**Direct edits:** 1. **Fresh external checks:** None; supplied sources retained as provenance.