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Discrete logistic population with constant quota harvest: extinction boundary · case 03

A stock harvested to exactly zero keeps a trajectory of zeros instead of stopping.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Each year the quota is removed first; if the stock is then <= 0 the trajectory records 0.0 and stops; otherwise the survivors grow by r*N*(1-N/K); the trajectory starts with the unharvested N0; values rounded to 4; None for K<=0 or negative N0.

Why this case matters

Population projections set harvest quotas, conservation status and pest-control timing; a wrong update order, boundary or rate conversion silently changes management advice.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: quota equals stock exactly	`[50.0, 0.0, 0.0]`	`[50.0, 0.0]`	Failed

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