MTX.ProperSubmoduleBasis(module) F
returns the action on a proper submodule and fail if no proper submodule
exists.
MTX.BasesSubmodules(module) F
returns a list containing a basis for every submodule.
MTX.BasesMinimalSubmodules(module) F
returns a list of bases of all minimal submodules.
MTX.BasesMaximalSubmodules(module) F
returns a list of bases of all maximal submodules.
MTX.BasesMinimalSupermodules(module,sub) F
returns a list of bases of all minimal supermodules of the submodule given by the basis sub.
MTX.BasesCompositionSeries(module) F
returns a list of bases of submodules in a composition series in ascending order.
MTX.CompositionFactors(module) F
returns a list of composition factors of module in ascending order.
MTX.CollectedFactors(module) F
returns a list giving all irreducible composition factors with their frequencies.
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GAP 4 manual