算术函数的均值问题在解析数论研究中占有十分重要的位置，许多著名的数论难题都与之密切相关。
Mean value problems of arithmetical functions play an important role in the study of analytic number theory, and they relate to many famous number theoretic problems.
新的功能包括用于模式匹配的正则表达式语法，新的日期函数比如当前日期，还有新的算术函数比如floor,ceiling和round。
New functions include regular expression syntax for pattern matching, new date functions such as current date, and new numeric functions such as floor, ceiling and round.
新的功能包括用于模式匹配的正则表达式语法，新的日期函数比如当前日期，还有新的算术函数比如floor,ceiling和round。
New functions include regular expression syntax for pattern matching, new date functions such as current date, and new numeric functions such as floor, ceiling and round.
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