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:<math> \Delta \phi \ge 0</math> on <math>G</math>
:where <math>\Delta</math> is the [[Laplacian]].
* The [[maxima and minima|maximum]] of a subharmonic function cannot be achieved in the [[interior (topology)|interior]] of its ___domain unless the function is constant, this is the so-called [[maximum principle]]. However, the [[minimum]] of a subharmonic function can be achieved in the interior of its ___domain.
* Subharmonic functions are upper [[semicontinuous]], while superharmonic functions are lower semicontinuous.
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