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#The electron energy quantization inside the conductors is ignored, i.e. the electron energy spectrum is treated as continuous, which is valid only if <math>E_k\ll k_{\rm B}T</math>, where ''k''<sub>B</sub> is [[Boltzmann constant|Boltzmann's constant]] and ''T'' is the temperature.
#The time (τ<sub>t</sub>) of electron tunnelling through the barrier is assumed to be negligibly small in comparison with the other time scales. This assumption is valid for tunnel barriers used in single-electron devices of practical interest, where τ<sub>t</sub> ~10<sup>-
#Coherent quantum processes consisting of several simultaneous tunnelling events, i.e. co-tunnelling, are ignored. This assumption is valid if the resistance of all the tunnel barriers of the system is much higher than the quantum resistance (~26 kΩ), to confine the electrons to the island.
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