gap-packages / qpa

GAP package for quivers and path algebras
https://folk.ntnu.no/oyvinso/QPA/
GNU General Public License v2.0
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Error when applying the Nakayama functor to the regular module over an enveloping algebra #9

Closed sunnyquiver closed 6 years ago

sunnyquiver commented 6 years ago

An error occur when applying the Nakayama functor to the regulr module over an enveloping algebra. The following example provokes the error, which was reported by Rene Marczinzik.

Q := Quiver(1,[[1,1,"x"],[1,1,"y"]]); kQ := PathAlgebra( GF( 3 ), Q ); AssignGeneratorVariables( kQ ); rel := [x^2,y^2,xy+yx]; A := kQ/rel; IsSymmetricAlgebra(A); C:=AlgebraAsModuleOverEnvelopingAlgebra(A);

NakayamaFunctorOfModule(C); The entered matrices for the module do not satisfy the relation(s). Error, no method found! For debugging hints type ?Recovery from NoMethodFound Error, no 1st choice method found for `IsAlgebraModule' on 1 arguments called from

called from called from DualOfModule( StarOfModule( M ) ) at /home/rene/Schreibtisch/gap4r8/pkg/QPA-1.25/lib/functors.gi:598 called f\ rom ( ) called from read-eval loop at line 9 of *stdin* you can 'quit;' to quit to outer loop, or you can 'return;' to continue brk> quit;