View source for Hilbert series and Hilbert polynomial

== Summary ==
Energy band diagram of a simple NPN [[bipolar junction transistor]] under equilibrium showing electron energy versus position.  The [[depletion region]]s of the emitter-base and base-collector junctions are marked.  <math>E_c</math> is the [[conduction band]], <math>E_f</math> is the device [[fermi energy]] level, <math>E_i</math> is the intrinsic Fermi level of the undoped semiconductor, and <math>E_v</math> is the [[valence band]].

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