Definition:Fedorov Group/Historical Note
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Historical Note on Fedorov Group
The Fedorov groups were first enumerated by Evgraf Stepanovich Fedorov in $1891$.
His original list had $2$ omissions and $1$ duplication.
Arthur Moritz Schönflies, also in $1891$, independently investigated the same groups, but his list had $4$ omissions and $1$ duplication.
In $1892$, Fedorov and Schönflies collaborated on the definitive list, via correspondence, establishing that there are $230$ Fedorov groups if chiral copies are taken as distinct, but $219$ if not.