Here the nonlinear
regime of structure formation is discussed.
The main difference between the formation of Lrge Scale Structure in
cosmology and gravitational instability in star formation is in the
pressureless regime of formation of the Large Scale Structure.
The abcense of pressure leads to the 2D object to be formed. These object
were predicted by Ya.B.Zeldovich and his followers:Andrey Doroshkevich
and Sergei Shandarin. The moder approach to the structure formation
is mainly numerical as far as it requires the solution of N body problems.
The analitical theory (Zeldovich approximation) is discussed here, followed
by the discussion of the numerical methids in the simulation of the
Large Scale Structure of our Universe.