Black-Scholes pricing model has no analytical formula of American put options, thus it cannot get accurate solution.
Black -Scholes定价模型对美式看跌期权不存在解析公式, 无法求其精确解.
When you prepare the solution, always use water you distil or spring water; avoid tap water at all costs.
配制溶液时务必使用你蒸馏的水或泉水,绝对避免使用自来水。
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