These notes present recent results in the value-distribution
theory of L-functions with emphasis on the phenomenon of
universality. In 1975, Voronin proved that any non-vanishing
analytic function can be approximated uniformly by certain shifts
of the Riemann zeta-function in the critical strip. This
spectacular universality property has a strong impact on the
zero-distribution: Riemann's hypothesis is true if and only if the
Riemann zeta-function can approximate itself uniformly (in the
sense of Voronin). Meanwhile universality is proved for a large zoo
of Dirichlet series, and it is conjectured that all reasonable
L-functions are universal. In these notes we prove universality for
polynomial Euler products. Our approach follows mainly Bagchi's
probabilistic method. We further discuss related topics as, e.g.,
almost periodicity, density estimates, Nevanlinna theory, and
functional independence.
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