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  • dx/dt=a-b*sin(x)?

    How should I approach this

    dx/dt=a-b*sin(x)

    ?

    I need to find the analytic solution.

    1 AnswerMathematics1 decade ago

  • Green's function (quantum)?

    I'm desperate. Does anyone know how to calculate a Green's function for a single impurity orbital? The problem hamiltonian consists of a free part for conduction electrons, free part for one impurity orbital and interaction between impurity state and free-electron state. The problem is very simple, with constant interaction energy. I've made all the contractions, just have no idea how to proceed with cross-terms between impurity and conduction electrons. I need advice on this or a link to a good book describing the effect. Please?

    1 AnswerPhysics1 decade ago

  • 1/(Z+i*Zr) -> exp(-i*psi(Z))?

    How to convert from 1/(Z+i*Zr) to exp(-i*psi(Z)), where psi(Z)=arctan(Z/Zr), Zr - constant?

    1 AnswerMathematics1 decade ago