Unit function
From Infogalactic: the planetary knowledge core
In number theory, the unit function is a completely multiplicative function on the positive integers defined as:
It is called the unit function because it is the identity element for Dirichlet convolution.[1]
It may be described as the "indicator function of 1" within the set of positive integers. It is also written as u(n) (not to be confused with μ(n)).
See also
References
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