Logarithmic integral function: Difference between revisions

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m Offset logarithmic integral: Typo fixing, replaced: than than → than using AWB
David9550 (talk | contribs)
rewrote since being a good approximation to the prime-counting function is a property of the logarithmic integral function in general, not of the offset logarithmic integral function in particular
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In [[mathematics]], the '''logarithmic integral function''' or '''integral logarithm''' li(''x'') is a [[special function]]. It is relevant in problems of [[physics]] and has [[number theory|number theoretic]] significance. In particular, occurringaccording into the [[prime numberSiegel-Walfisz theorem]] asit is a very angood [[Approximation|estimateapproximation]] ofto the [[prime-counting function]], which is defined as the number of [[prime numbernumbers]]s less than a given value <math>x</math>. [[Image:Logarithmic integral function.svg|thumb|right|300px|Logarithmic integral function plot]]
[[Image:Logarithmic integral function.svg|thumb|right|300px|Logarithmic integral function plot]]
 
==Integral representation==
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As such, the integral representation has the advantage of avoiding the singularity in the ___domain of integration.
 
This function is a very good approximation to the [[prime-counting function]], which is defined as the number of prime numbers less than a given {{math|x}}.
 
==Special values==