Scaling symmetries

thumb|right|250px|A Koch snowflake has an infinitely repeating self-similarity when it is magnified. thumb|300px|Standard (trivial) self-similarity

quantum field theory enjoying conformal symmetry

method for using scale changes to understand physical theories such as quantum field theories

features that do not change if length or energy scales are multiplied by a common factor

function that encodes the dependence of a coupling parameter on the energy scale

extension to the Poincaré group

Integer sequence