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## Symmetry and Physics

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**Origin**• Greeks • Copernicus & Kepler • 19th century • 20th century**Painting**Sculpture Music Literature Architecture**Harmony of the Spheres**Dogma of the Circles**Copernicus (1473-1543)**Kepler (1571-1630)**Six planets:**Saturn, Jupiter, Mars, Earth, Venus, Mercury**One of the methods now to find reasons of some observed**regularity:**Choose some mathe- matical regularity resulting from**symmetry require- ments.(b) Match it to observed regularity.**Discussed why snow flakes are 6-sided**• Albertus Magnus:+1260 • In China: -135**19th Century**Groups and Crystals**Concept of groups is the mathematical representation of**concept of symmetry.**Symmetry**and invariance**It will be denoted by 4.**It is an invariant element of the graph.**3 dimensional 230 (1890)**2 dimensional 17 (1891) 4 dimensional 4895 (~1970)**Special Relativity**1905 Lorentz Symmetry**General Relativity**1916 Very Large Symmetry