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From the Schrodinger wave equation, I kind of understand what a wave function and hence a wave vector is, so I understand what a wave vector of an electron wave is.

However while talking about crystals, there is also a 'crystal wave vector'.Is this a vector sum of wave vectors of individual electrons?

While finding density of states of electrons, why is the electron wave vector used instead of the crystal wave vector?

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# Understanding of crystal wave vector

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