> Can you write a few more words about the project? Which disturbance > theory, how the corrections would be calculated and how sympy would be > used, and which features will be improved? > > Ondrej Thanks for questions, Ondrej. Perturbation theory comprises mathematical methods that are used to find an approximate solution to a problem which cannot be solved exactly, by starting from the exact solution of a related problem. Perturbation theory is applicable if the problem at hand can be formulated by adding a "small" term to the mathematical description of the exactly solvable problem. For example if we should calculate approximation for hydrogen atom in magnetic field using eigenfunctions and energy levels calculate without field. Corrections will be calculated due to classic theory through perturbation matrix elements. More about http://en.wikipedia.org/wiki/Perturbation_theory_(quantum_mechanics) . SymPy will be used as tool set for it, because there implemented large part of required functionality. Also I want implement working with creation and annihilation operators which will be good improvement, cause it simplify many calculations in quantum theory. Anatolii
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