These lecture notes give an introduction to a number of ideas and methods
that have been useful in the study of complex systems ranging from spin glasses
to D-branes on Calabi-Yau manifolds. Topics include the replica formalism,
Parisi's solution of the Sherrington-Kirkpatrick model, overlap order
parameters, supersymmetric quantum mechanics, D-brane landscapes and their
black hole duals.Comment: 109 pages, 16 figure