AbstractThe real form problem asks how many different ways one can describe a given complex variety by polynomial equations with real coefficients, up to isomorphisms over the real number field. In this talk, I will discuss some recent results about smooth complex projective varieties with infinitely many real forms. This talk is based on joint works with T.-C. Dinh, C. Gachet, H.-Y. Lin, K. Og...
AbstractThe derived category of an orbifold projective line with positive Euler characteristic is equivalentto the one of an extended Dynkin quiver. For a Dynkin quiverObaidNaumanShammakhFakiehRingel gave a counting formula for the number of full exceptionalcollections in the derived category. The number coincides with the degree of the LyashkoLooijengamap for an ADE singularity. The equality o...