Topics in random matrix theory and spectral theory of operators on Riemannian manifolds.

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Large systems consisting of many elementary components obeying simple binary interaction rule are very effectiverepresentatives of complex systems. As the number of constituents increases collective behaviour involving largenumber of the elementaries emerges. It turns out that eigenvalues of large random matrices --- square array of numbers drawn with theaid of the throw of a die (which accounts for the randomness) and itscontinuous generalization involving differentiation---also behave in a similar manner. In these projects the behaviour of thethe eigenvalues in both instances will give value insights into the model complex systems.