Group Symmetry

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String Duality
... Before the so-called "duality revolution" there were believed to be five distinct versions of string theory, plus the (unstable) bosonic and gluonic theories ... String Theories Type Spacetime dimensions Details Bosonic 26 Only bosons, no fermions means only forces, no matter, with both open and closed strings major flaw a particle with imaginary mass, called the tachyon, representing an instability in the theory ...

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