Editing Harmonic function (section)

=== Removal of singularities ===
The following principle of removal of singularities holds for harmonic functions. If {{mvar|f}} is a harmonic function defined on a dotted open subset <math>\Omega \smallsetminus \{x_0\}</math> of {{tmath|\R^n}}, which is less singular at {{math|''x''{{sub|0}}}} than the fundamental solution (for {{math|''n'' > 2}}), that is
<math display="block">f(x)=o\left( \vert x-x_0 \vert^{2-n}\right),\qquad\text{as }x\to x_0,</math>
then {{mvar|f}} extends to a harmonic function on {{math|Ω}} (compare [[removable singularity#Riemann's theorem|Riemann's theorem]] for functions of a complex variable).