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利用Ｂａｎａｃｈ空间理论，讨论了森林发展系统中，采消率和造林更新与采消面积之比率的最优控制问题，给出了其最优解的存在唯一性
Using Banach space theory, the optimal control problem of the rate of forest withdrawal and the ratio of forestation to forestation is discussed, and the existence and uniqueness of the optimal solution are given