Hi all, as mentioned in the call today, I have drawn a diagram to explain "sharpness". The first page contains some explanations, the second page contains a black-white-version of the diagram. I have noticed, that Karbon does not show the Math formula well. Therefore I have converted the formula to a metafile format and included that picture as well. Kind regards Regina Attachment: regularPolygon for ODF TC.odg Description: application/vnd.oasis.opendocument.graphics