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Dilogarithm (double logarithm) *Real numbers only (x ≤ 1)

Author: QuadpackExecutions: 48
TOP/Shared Formulas (Math)/Advanced Math

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Calculates the value of the dilogarithm (double logarithm).
Calculations are possible for x ∈ (-∞, 1].
For x > 1, Li(2, x) is not a real number; since this is not implemented, 0 is returned as an error.
x
Li(2,x) 
Li(2,x) = sum(x^k/k^2,(k,1,∞)) = -∫(ln(1-t)/t,(t,0,x))

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