The spreading-speed minimizer r = α(2 - <d>_h/d) is claimed to attain the lower bound 2√(<d>_h<r>_a), but the equality condition only holds after an unstated period normalization and is contradicted by the paper's own variational formula.
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Determining the optimal coefficient of the spatially periodic Fisher-KPP equation that minimizes the spreading speed
The spreading-speed minimizer r = α(2 - <d>_h/d) is claimed to attain the lower bound 2√(<d>_h<r>_a), but the equality condition only holds after an unstated period normalization and is contradicted by the paper's own variational formula.