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Overline1 is a mathematical notation used to indicate the sum of a sequence of numbers. It is represented by a horizontal line drawn above a number or a sequence of numbers. The overline notation is often used in algebra and calculus to denote the sum of a series or the average of a set of numbers. For example, the overline of a sequence of numbers (a1, a2, a3, ..., an) is written as a¯, which represents the average of the numbers in the sequence. The overline notation is also used in calculus to denote the limit of a sequence or the limit of a function as it approaches a certain value. In this context, the overline notation is used to indicate that the limit exists and is equal to a certain value. Overall, the overline notation is a useful tool in mathematics for representing sums, averages, and limits.