<math xmlns="http://www.w3.org/1998/Math/MathML" id="p1.1.m1.1" class="ltx_Math" alttext="{\displaystyle{\displaystyle\eta<0}}" display="inline"> η < 0 <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <apply id="p1.1.m1.1.4.cmml" xref="p1.1.m1.1.4"> <lt id="p1.1.m1.1.2.cmml" xref="p1.1.m1.1.2"/> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">𝜂</ci> <cn type="integer" id="p1.1.m1.1.3.cmml" xref="p1.1.m1.1.3">0</cn> </apply> </annotation-xml> {\displaystyle{\displaystyle\eta<0}}
! <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <factorial id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1"/> </annotation-xml> {\displaystyle{\displaystyle!}}
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}}
ℓ <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">ℓ</ci> </annotation-xml> {\displaystyle{\displaystyle\ell}}
ρ <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">𝜌</ci> </annotation-xml> {\displaystyle{\displaystyle\rho}}
η <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">𝜂</ci> </annotation-xml> {\displaystyle{\displaystyle\eta}}
t <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b"> <ci id="p1.1.m1.1.1.cmml" xref="p1.1.m1.1.1">𝑡</ci> </annotation-xml> {\displaystyle{\displaystyle t}}
b k <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">𝑏</ci> <ci id="p1.1.m1.1.2.1.cmml" xref="p1.1.m1.1.2.1">𝑘</ci> </apply> </annotation-xml> {\displaystyle{\displaystyle b_{k}}}