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}}
a <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">𝑎</ci> </annotation-xml> {\displaystyle{\displaystyle a}}
x s <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">𝑠</ci> </apply> </annotation-xml> {\displaystyle{\displaystyle x_{s}}}