. . . "\\(m^* = \\hbar^2k(\\frac{d\\varepsilon}{dk})\\), where \\(\\hbar\\) is the reduced Planck constant, \\(k\\) is the wavenumber, and \\(\\varepsilon\\) is the energy of the electron."^^ . . . . . . . . . . . . "Effective Mass"@en . . . . . . . . . . . "m^*" . . . . "\"Effective Mass\" is used in the motional equation for electrons in solid state bodies, depending on the wavenumber and corresponding to its velocity and energy level." . . . . . "http://www.iso.org/iso/catalogue_detail?csnumber=31897"^^ . . . . . "http://en.wikipedia.org/wiki/Effective_mass_(solid-state_physics)"^^ . . . . . . . . . . . . . . . .