The interplay between the spectral theory of Schr-dinger operators
and probabilistic considerations forms the main theme of these
notes, written for the non-specialist reader and intended to
provide a brief and elementaryintroduction to this field. An
attempt is made to show basic ideas in statu nascendi and to follow
their evaluation from simple beginnings through to more advanced
results. The term "genetic" in the title refers to this proceedure.
The author concentrates on 2 topics which, in the history of the
subject, have been of major conceptual importance - on the one hand
the Laplacian is a random medium and the left end of its spectrum
(leading to large deviation problems for Brownian motion and the
link to thenotion of entropy) and on the other, Schr-dinger
operators with general ergodic potentials in one-dimensional space.
Ideas and concepts are explained in the simplest, possible setting
and by means of a few characteristic problems with heuristic
arguments preceding rigorous proofs.
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