Noether's definition of right and left ideals? could anyone provide me with Emmy Noether's definition of right and left ideals? The German original and references would be welcome. 
I am assuming she was the one who first coined those two kinds of one-sided ideals, though the term ideal was already in use in Dedekind. But maybe my assumption is wrong. Feel free to correct me if necessary.
Thanks in advance
 A: I don’t know when or by whom they were first introduced, but Noether deals with them in her paper Hyperkomplexe Größen und Darstellungstheorie, Mathematische Zeitschrift $30$ $(1929)$, $641$-$692$, available here. On p. $646$, the second page of the first chapter, we find the following:

$3$. $\mathfrak{G}$ sei ein Ring, d. h. eine Abelsche Gruppe gegenüber Addition, wo auch eine Multiplikation definiert ist, mit den Eigenschaften
$$\begin{align*}
r(a+b)&=ra+rb\\
(a+b)r&=ar+br\\
ab\cdot c&=a\cdot bc\;.
\end{align*}$$
Jedes Element $r$ definiert zugleich zwei Operatoren: die Operatoren $rx$ und $xr$. Zugelassene Untergruppen sind die „Ideale“ $\mathfrak{a}$, und zwar:
  
  
*
  
*linksseitige, die die Operationen $rx$ gestatten: $r\mathfrak{a}\subseteqq\mathfrak{a}$;  
  
*rechtsseitige, die die Operationen $xr$ gestatten: $\mathfrak{a}r\subseteqq\mathfrak{a}$;  
  
*zweiseitige, die beide Operationen gestatten.
  

This terminology can still be seen, as in this article in German Wikipedia, though I have the impression that Linksideal and Rechtsideal are now more common.
