person Posted July 6, 2008 Share Posted July 6, 2008 I know this is a physics question but the answer is mathematical. In Stephen Hawking's "A Brief History of Time" he says that there is an equation that explains how a particle will not look the same if one rotates it 360 degrees but it will look the same if it is rotated 720 degrees. Can anyone explain this equation? Link to comment Share on other sites More sharing options...
swansont Posted July 6, 2008 Share Posted July 6, 2008 Spin 1/2 particles are described by spinors http://www.sjsu.edu/faculty/watkins/spinor.htm Link to comment Share on other sites More sharing options...
ajb Posted July 6, 2008 Share Posted July 6, 2008 I will echo swansont post. look up representations of the Poincare group, spinors and the Dirac equation. Link to comment Share on other sites More sharing options...
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