added optional argument check to haspreimage, improved an error message
#1138
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due to a GAP bug (see gap-system/gap/issues/4809), we have to check for membership in the image not in the codomain
fingolfin
approved these changes
Mar 2, 2022
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haspreimage: Due to a GAP bug (see problem withPreImagesRepresentativegap-system/gap#4809), we have to check for membership in the image not in the codomain.permnow says that the given list of images does not describe a permutation if this is the case.