But there is no the analytical solution for the American look-back option because of the complication of the initial and boundary conditions,so the characters for the solution of the American look-back option is blank.
但是由于美式回望期权初、边值条件的复杂性,至今无法求出其解析解,对其解析解的性质研究也甚少。
参考来源 - 美式回望期权同伦近似解的研究 （研究生论文）·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
Meanwhile, Chris Smalling is beginning to make the right-back spot look like a natural option for him when he can't play his normal role in the center of defense.
与此同时，斯莫林在右后卫位置上的异军突起，令他无法正常发挥其在后防线中的作用。
He said: "I will look at the option of recalling some loan players. People like Jay Emanuel-Thomas, Kyle Bartley and Henri Lansbury could come back."
他说：“我将会看看是否会召回一些外租球员，比如JET，巴特利，兰斯布里可能回来。
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