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的唯一实根（即 余弦 函数的唯一实 不动点），其值为 0.739085... (OEIS A003957)。 “Dottie” 这个名称没有根本的数学意义，因为它指的是一位法国教授，她（无疑像许多其他在她之前和之后的计算器用户一样）注意到，每当她在计算器中输入一个数字并反复按下余弦按钮时，结果总是收敛到这个值。
是 
给出了 几乎是整数
." Proc. Edinburgh Math. Soc. 9, 80-83, 1890.Miller, T. H. "On the Imaginary Roots of 
." Proc. Edinburgh Math. Soc. 21, 160-162, 1902.Salov, V. "Inevitable Dottie Number. Iterals of Cosine and Sine." 1 Dec 2012.