"M\u00F6bius transform redirects here. It should not be confused with M\u00F6bius transformation.In mathematics, the classic M\u00F6bius inversion formula was introduced into number theory during the 19th century by August Ferdinand M\u00F6bius. Other M\u00F6bius inversion formulas are obtained when different locally finite partially ordered sets replace the classic case of the natural numbers ordered by divisibility; for an account of those, see incidence algebra."@en . .