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`UnderlyingInjectionZeroMagma` is injective but not surjective: the adjoined zero is not in its image. GAP currently marks it bijective by mistake, which makes `x ^ InverseGeneralMapping( inj )` work. Once GAP fixes that (gap-system/gap#6767), the inverse is no longer total and `^` raises an error, breaking `IsomorphismPartialPermSemigroup` for zero groups. Use `PreImagesRepresentative` instead, which works with both old and fixed GAP versions. Assisted-by: Generative AI
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UnderlyingInjectionZeroMagmais injective but not surjective: the adjoined zero is not in its image. GAP currently marks it bijective by mistake, which makesx ^ InverseGeneralMapping( inj )work. Once GAP fixes that (gap-system/gap#6767), the inverse is no longer total and^raises an error, breakingIsomorphismPartialPermSemigroupfor zero groups.Use
PreImagesRepresentativeinstead, which works with both old and fixed GAP versions.Assisted-by: Generative AI