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It was said of Jordan's writings that if he had 4 things
on the same footing (as $a$, $b$, $c$, $d$) they would appear
as $a$, $M'_3$, $\epsilon_2$ and $\Pi''_{1,2}$.
\begin{flushright}
Littlewood (1986), p.~60.
\end{flushright}
\end{list}

