i <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <csymbol cd="dlmf" id="p1.1.m1.1.1.1.cmml" xref="p1.1.m1.1.1.2">imaginary-unit</csymbol> </annotation-xml> {\displaystyle{\displaystyle\mathrm{i}}}
∂ ⁡ x <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <apply id="p1.1.m1.1.1.1.cmml" xref="p1.1.m1.1.1.2"> <partialdiff id="p1.1.m1.1.1.1.1.cmml" xref="p1.1.m1.1.1.2.1"/> <ci id="p1.1.m1.1.1.2.2.cmml" xref="p1.1.m1.1.1.2.2">𝑥</ci> </apply> </annotation-xml> {\displaystyle{\displaystyle\partial\NVar{x}}}
n <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">𝑛</ci> </annotation-xml> {\displaystyle{\displaystyle n}}
K <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">𝐾</ci> </annotation-xml> {\displaystyle{\displaystyle K}}
x i <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <apply id="p1.1.m1.1.3.cmml" xref="p1.1.m1.1.3"> <csymbol cd="ambiguous" id="p1.1.m1.1.3.1.cmml" xref="p1.1.m1.1.3">subscript</csymbol> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">𝑥</ci> <ci id="p1.1.m1.1.2.1.cmml" xref="p1.1.m1.1.2.1">𝑖</ci> </apply> </annotation-xml> {\displaystyle{\displaystyle x_{i}}}