The Character of Physical Law
A legendary series of seven lectures by physicist Richard Feynman concerning the nature of the laws of physics.
4. Symmetry in Physical Law
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In this lecture, Dr. Richard Feynman discusses symmetry in physical law. He covers translation in space, translation in time, rotation in space, the principle of relativity, symmetry in atomic particles, changes in scale, uniform angular speed, and reflection in space. He also discusses the relationship between conservation laws and symmetry, and concludes with a brief look at antimatter.