This criteria of who can be considered a world-class polymath would always be arbitrary but it needs to be defined and it should be based on high standards.
Generaly polymath must have notable achievements within several DIFFERENT and NON-RELATED subject areas, typically in both arts and sciences. For instance, achievements in biology, chemistry and physics are considered to be related, since all three belong to Natural Sciences.
Non-related subject areas in this list identified by 13 subcategories, such as Visual Arts, Natural Sciences, Engineering. "Other" subcategory may include additional activities, such as Computing, Agriculture or Sports.
Vincent Brown, PhD