On the Two q-Analogue Logarithmic Functions

Details On the Two q-Analogue Logarithmic Functions On the Two q-Analogue Logarithmic Functions

1996-08-19

arxiv.org/abs/q-alg/9608015v3

Mathematics

Quantum Algebra

This is the final version to appear in J.Phys.A: Math. & General. Some explict formulas added, and to update the references

Scientific paper

10.1088/0305-4470/29/24/031

There is a simple, multi-sheet Riemann surface associated with e_q(z)'s inverse function ln_q(w) for 0< q < 1. A principal sheet for ln_q(w) can be defined. However, the topology of the Riemann surface for ln_q(w) changes each time "q" increases above the collision point of a pair of the turning points of e_q(x). There is also a power series representation for ln_q(1+w). An infinite-product representation for e_q(z) is used to obtain the ordinary natural logarithm ln{e_q(z)} and the values of sum rules for the zeros "z_i" of e_q(z). For |z|<|z_1|, e_q(z)=exp{b(z)} where b(z) is a simple, explicit power series in terms of values of these sum rules. The values of the sum rules for the q-trigonometric functions, sin_q(z) and cos_q(z), are q-deformations of the usual Bernoulli numbers.

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