Chebyshev function

In mathematics, the Chebyshev function is either of two related functions. The first Chebyshev function ϑ(x) or θ(x) is given by

with the sum extending over all prime numbers p that are less than or equal to x.

The second Chebyshev function ψ(x) is defined similarly, with the sum extending over all prime powers not exceeding x:

单词	Chebyshev function
释义	Chebyshev function 英语百科 Chebyshev function In mathematics, the Chebyshev function is either of two related functions. The first Chebyshev function ϑ(x) or θ(x) is given by with the sum extending over all prime numbers p that are less than or equal to x. The second Chebyshev function ψ(x) is defined similarly, with the sum extending over all prime powers not exceeding x:
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