{ a n } {\displaystyle \{a_{n}\}} 是一个趋于零的递减数列时, ∑ n = 1 ∞ a n sin n {\displaystyle \sum _{n=1}^{\infty }a_{n}\sin n} 收敛。 Hardy, G. H., ACourseof Pure
Society)年度客座講師。 羅特曼的部分著作包括: An Introduction to Homological Algebra (1979), Pure and Applied Mathematics, vol. 85, Academic Press; ISBN 0-12-599250-5 An Introduction
(页面存档备份,存于互联网档案馆) Precalculus course at TheMathPage Stitz and Zeager - Precalculus Lippman and Rasmussen - Precalculus: An Investigation of Functions (页面存档备份,存于互联网档案馆)