GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
\begin{theindex}
\item \texttt{ApplicableMethod}, \hyperpage{75}
\item arrays, see lists, \hyperpage{19}
\item assignment, \hyperpage{13}
\item \texttt{AsSomething}, \hyperpage{68}
\indexspace
\item break loops, \hyperpage{11}
\indexspace
\item canonical position, \hyperpage{44}
\item \texttt{ClosureSomething}, \hyperpage{68}
\item cokernel, \hyperpage{52}
\item comments, \hyperpage{9}
\item constants, \hyperpage{11}
\indexspace
\item elements, \hyperpage{15}
\item enumerator, \hyperpage{44}
\indexspace
\item family, \hyperpage{24}
\item filters, \hyperpage{72}
\indexspace
\item \texttt{GeneratorsOfSomething}, \hyperpage{67}
\item getter
\subitem of an attribute, \hyperpage{71}
\item group general mapping, \hyperpage{52}
\subitem single-valued, \hyperpage{52}
\subitem total, \hyperpage{52}
\item \texttt{GroupHomomorphismByImages} vs. \texttt{GroupGeneralMappingByImages},
\hyperpage{52}
\indexspace
\item homomorphism
\subitem action, \hyperpage{44}
\subitem natural, \hyperpage{40}
\subitem operation, \hyperpage{44}
\indexspace
\item identifier, \hyperpage{13}
\item \texttt{IsIdenticalObj}, \hyperpage{15}
\indexspace
\item kernel, \hyperpage{52}
\item \texttt{KnownAttributesOfObject}, \hyperpage{75}
\item \texttt{KnownPropertiesOfObject}, \hyperpage{75}
\item \texttt{KnownTruePropertiesOfObject}, \hyperpage{75}
\indexspace
\item \texttt{last}, \hyperpage{14}
\item \texttt{last2}, \hyperpage{14}
\item \texttt{last3}, \hyperpage{14}
\item leaving \textsf{GAP}, \hyperpage{8}
\item line editing, \hyperpage{10, 11}
\item lists
\subitem dense, \hyperpage{21}
\subitem identical, \hyperpage{22}
\subitem plain, \hyperpage{19}
\subitem strictly sorted, \hyperpage{24}
\item loading source code from a file, \hyperpage{9}
\item loop
\subitem for, \hyperpage{26}
\subitem while, \hyperpage{26}
\indexspace
\item maps-to operator, \hyperpage{16}
\item matrices, \hyperpage{29}
\item methods, \hyperpage{71}
\subitem immediate, \hyperpage{74}
\subitem selection, \hyperpage{72}
\subitem true, \hyperpage{74}
\indexspace
\item objects, \hyperpage{13}
\subitem vs. elements, \hyperpage{15}
\subitem vs. variables, \hyperpage{13}
\item operations, \hyperpage{74}
\item operators, \hyperpage{11}
\indexspace
\item \texttt{quit}, \hyperpage{8}
\indexspace
\item \texttt{Read}, \hyperpage{9}
\item read evaluate print loop, \hyperpage{9}
\item reading source code from a file, \hyperpage{9}
\indexspace
\item setter
\subitem of an attribute, \hyperpage{71}
\item \texttt{Something}, \hyperpage{68}
\item starting \textsf{GAP}, \hyperpage{8}
\item strings, \hyperpage{21}
\item \texttt{Subsomething}, \hyperpage{69}
\item \texttt{SubsomethingNC}, \hyperpage{69}
\indexspace
\item tester
\subitem of an attribute, \hyperpage{71}
\item \texttt{TraceMethods}, \hyperpage{75}
\item transversal, \hyperpage{44}
\item \texttt{TryNextMethod}, \hyperpage{73}
\indexspace
\item variables, \hyperpage{13}
\item vectors
\subitem row, \hyperpage{29}
\indexspace
\item whitespace, \hyperpage{9}
\end{theindex}