  We give detailed exposition of modern differential geometry from global
coordinate independent point of view as well as local coordinate description
suited for actual computations. In introduction, we consider Euclidean spaces
and different structures on it; rotational, Lorentz, and Poincare groups;
special relativity. The main body of the manuscript includes manifolds, tensor
fields, differential forms, integration, Riemannian and Lorentzian metrics,
connection on vector and frame fiber bundles, affine geometry, Lie groups,
transformation groups, homotopy and fundamental group, coverings, principal and
associated fiber bundles, connections on fiber bundles, Killing vector fields,
geodesics and extremals, symplectic and Poisson manifolds, Clifford algebras,
principle of least action, canonical formalism for constrained systems.
Applications of differential geometry in quantum theory (adiabatic theorem,
Berry phase, Aharonov-Bohm effect), general relativity and geometric theory of
defects are described. We give introduction to general relativity and its
Hamiltonian formulation; describe scalar, spinor, electromagnetic and
Yang-Mills fields. Riemannian and Lorentzian surfaces with one Killing vector
field are discussed in detail, and their global structure is described using
conformal block method. We also classified all global vacuum solutions of the
Einstein equations, which have the form of warped product metrics of two
surfaces. The manuscript is not a textbook, and intended for efficient reader.
