Editing LogarithmicIntegral
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The function EQN:\text{Li}(x)=\int_2^x\frac{dx}{\log~x} is called the "logarithmic integral". According to the Prime Number Theorem, it is approximately equal to the number of primes below /x./ The function EQN:\text{li}(x)=\int_0^x\frac{dx}{\log~x} is also called the logarithmic integral; the two functions differ by a constant. (Since the definition of EQN:\text{li}(x) involves integrating through a singularity, some care is needed in interpreting the definition.)