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}}}
y <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">𝑦</ci> </annotation-xml> {\displaystyle{\displaystyle y}}
z <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">𝑧</ci> </annotation-xml> {\displaystyle{\displaystyle z}}
m <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">𝑚</ci> </annotation-xml> {\displaystyle{\displaystyle m}}