Quelle EpimorphismStandardPresentation-i
Sprache: unbekannt
#Example: "EpimorphismStandardPresentation-i" . . based on manual example #(demonstrates interactive `EpimorphismStandardPresentation' usage) #vars: F, x, y, z, w, a, b, R, Q, procId, G, phi, lev; #options:
F := FreeGroup(6, "F"); ##For printing GAP uses the symbols F1, ... for the generators of F
x := F.1; y := F.2; z := F.3; w := F.4; a := F.5; b := F.6;
R := [x^3 / w, y^3 / w * a^2 * b^2, w^3 / b,
Comm (y, x) / z, Comm (z, x), Comm (z, y) / a, z^3 ];
Q := F / R;
procId := PqStart( Q );
G := Pq( procId : Prime := 3, ClassBound := 3 );
lev := InfoLevel(InfoANUPQ); # Save current InfoANUPQ level
SetInfoLevel(InfoANUPQ, 2);; # To see computation time data ## It is not necessary to pass the `Prime' option to ## `EpimorphismStandardPresentation' since it was previously ## passed to `Pq':
phi := EpimorphismStandardPresentation( procId : ClassBound := 3 ); ## Image of phi should be isomorphic to G ... ## let's check the order is correct:
Size( Image(phi) ); ## `StandardPresentation' and `EpimorphismStandardPresentation' ## behave like attributes, so no computation is done when ## either is called again for the same process ...
StandardPresentation( procId : ClassBound := 3 ); ## No timing data was Info-ed since no computation was done
SetInfoLevel(InfoANUPQ, lev);; # Restore previous InfoANUPQ level
Messung V0.5 in Prozent
[Dauer der Verarbeitung: 0.10 Sekunden, vorverarbeitet 2026-06-18]